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VALLAREN / PLUG-INS / AudioOverNetwork
AES67 · SMPTE ST 2110-30 · NMOS · PTPv2 · Open Source · Public beta

Real-time, multi-channel audio over an ordinary network.

AudioOverNetwork turns a plain Ethernet or Wi-Fi LAN into a low-latency, multi-channel audio link. It ships as a macOS Standalone app and an Audio Unit, so it runs on its own or inside any AU host. A single instance flips between Send and Receive at runtime, carrying up to 16 discrete channels between machines — or between apps on one machine — with sub-5 ms latency on a wired connection. And because it streams over multicast, the same feed can be picked up at any number of points on the LAN with no added load on the sender. Free, MIT-licensed, local-only.

AudioOverNetwork interface: a network and audio control panel on the left sending 16 channels of AES67 to 192.168.1.233, beside a 16-channel level meter bridge, with a Streams-on-LAN status strip showing Multicast OK, PTP Master, and RTP/PTP.
Latency< 5 ms · wired
ChannelsUp to 16
Wire formatsAES67 · AoN-native
ClockPTPv2 · IEEE 1588
FormatsAU · Standalone
LicenseMIT · free
Version0.2.0 · public beta
01 / What it is

Send or receive. One instance. One toggle.

A single instance of AoN switches between transmitting and receiving at runtime — no separate apps to manage. It speaks two wire formats: AoN-Native, an efficient float32 protocol for AoN-to-AoN links, and AES67 / SMPTE ST 2110-30 (industry-standard L24 RTP) for interoperating with professional broadcast and install infrastructure.

Mode · Off

Pass-through

Audio passes through untouched and nothing hits the network. A bypass you can leave loaded on the track.

Mode · Send

Packetize & transmit

Take the track's input, packetize it, and transmit to a destination host and port. Up to 16 channels, in AES67 (RTP L24, ST 2110-30 compatible) or the lower-overhead AoN-Native float32 format.

Mode · Receive

Bind & pull audio

Bind a UDP port, join the multicast group if relevant, and pull audio into the track's output through an adaptive jitter buffer — with clock-drift compensation and packet-loss concealment on the receive side.

02 / Topology

Send once. Heard everywhere.

Because AoN streams over IP multicast, the sender transmits a single copy and the network switch replicates it to every machine that subscribes. Pick up the same 16 channels at any number of points on the LAN — with zero added load on the sender. One listener or twenty, the source machine's outbound bandwidth is identical. AoN handles peer discovery, PTPv2 clock alignment, and NMOS interop — no external word clock, no proprietary hardware.

One multicast stream out of the sender Switch-replicated copy · per subscriber PTPv2 · all nodes phase-locked
Sender bandwidth
Flat · 1 copy

The source transmits a single multicast group whether one machine listens or fifty. Its outbound load never changes as you add tap points.

Add a listener
Join · IGMP

Any machine on the LAN subscribes to the group and starts receiving — no reconfiguration of the sender, no new connection to set up.

Switch does the work
Hardware

IGMP-snooping switches replicate packets at line rate and only down ports that asked for the group — so idle machines and the rest of the network stay quiet.

03 / In the field

One head-end. The whole property.

For an AV integrator wiring a casino or entertainment venue, multicast is the whole game. Drop a small head-end rack of Macs running AoN in Send mode, define a multicast group per program feed, and every zone on the floor pulls exactly what it needs straight off the house IP network — no proprietary DSP backbone, no dedicated audio cabling, no per-endpoint licensing. Adding the new sportsbook annex or a pop-up stage is a switch port and a subscription, not a recabling job.

Main program · live Sportsbook feed BGM / lounge Paging / life-safety · priority
Group .10
Main Theater

Full 8-channel stage mix, phase-locked to the lighting and video systems over PTP.

Group .20
Sportsbook

Dedicated commentary feed across the display wall, switchable per game-day.

Group .30
Gaming Floor

Curated background music, level-managed per zone, all pulling one shared stream.

Group .10
Pool & Dayclub

Subscribes to the main program for live overflow, or breaks away to its own DJ source.

01 Runs on the network they already specced

AoN rides the same managed switches and fiber backbone as the property's IPTV, signage, and data — so the audio system is a VLAN and a few IGMP groups, not a parallel infrastructure. One less cable plant to design, install, and certify.

02 Scales by subscription, not by hardware

A new bar, a seasonal stage, a buildout across the skybridge — each new zone is a Mac (or AoIP endpoint) that joins a group. Sender count and head-end load don't change, so the design scales linearly with no surprise DSP-channel ceiling.

03 Orchestrated from the control system

Because AoN is an NMOS node, the house Crestron / Q-SYS / control layer can re-route zones, swap sources, and arm paging programmatically over IS-05 — no truck roll to repatch a room for a private event.

04 / What it does

Everything a hardware AoIP node does — in a plugin.

F.01

Multicast fan-out — pick up the audio anywhere, no added overhead

Send to a multicast group and the stream is available at every point on the network at once. Front-of-house, monitor world, a record rig, an overflow room — each one just subscribes, and the switch replicates the packets in hardware. The sender transmits a single copy, so its bandwidth stays flat whether one machine listens or fifty. Add or drop tap points live, with no reconfiguration on the source.

IP multicast · one-to-many · constant sender bandwidth · IGMP
F.02

Send or receive any time, up to 16 channels

Flip a single instance between transmitting and receiving — no separate apps to manage. Stream anything from a mono feed to a full 16-channel multitrack across the network, or between two apps on the same machine. Unicast point-to-point is supported too when you want a private link.

Runtime Send ↔ Receive · 1–16 ch · multicast or unicast
F.03

Two protocols — lowest overhead, or standards interop

AoN-Native is an efficient float32 format for the lowest-overhead point-to-point links between AoN instances. AES67 / ST 2110-30 (L24 RTP, 1 ms packet time) is bit-compatible with broadcast consoles, AES67 devices, and Dante networks running in AES67 mode.

AoN-Native float32 · AES67 · ST 2110-30
F.04

Clock-drift compensation keeps long runs glitch-free

A built-in adaptive sample-rate converter on the receive side continuously tracks the sender's clock, so two interfaces running on independent crystals stay locked for hours without an external word clock — no slow buffer drift, no periodic dropouts.

Adaptive SRC · no external word clock
F.05

Packet-loss concealment instead of clicks

Lost packets are smoothed over with a fading replay of the last good audio rather than hard clicks. Combined with sequence-accurate reordering and a hard latency cap, the stream degrades gracefully when the network gets busy.

Fading concealment · sequence-ordered · latency cap
F.06

PTPv2 clock — your Mac is the grandmaster

Each instance runs a complete IEEE 1588 PTPv2 engine that auto-elects master or slave on the network via the Best Master Clock Algorithm, enabling phase alignment with other AES67 / ST 2110 sources. If a hardware grandmaster is present, AoN slaves to it; RTP timestamps anchor to PTP wall time per RFC 7273.

IEEE 1588-2008 · BMCA · auto-elect · RFC 7273
F.07

Zero-config discovery over three independent paths

Instances find each other automatically via Bonjour (mDNS/DNS-SD), UDP multicast, and a same-machine registry — peers show up by name in a live Streams panel for click-to-pair. If one path is blocked, the others still work, and manual IP entry is always available as a fallback.

Bonjour · UDP multicast · same-host registry · manual IP
F.08

Broadcast discovery — acts as an NMOS node

AoN is an NMOS IS-04 node and exposes an IS-05 Connection API, so AMWA-aware controllers and receivers — Blackmagic Fairlight, NMOS test tools — can discover it and orchestrate subscriptions. It also exports an .sdp file for manual receiver setup.

NMOS IS-04 · IS-05 · SDP export · port 8042
F.09

16-channel meter bridge with live transport telemetry

A glanceable level display gives every channel peak / RMS, peak-hold, and clip indicators, alongside live telemetry — packets/sec, latency estimate, multicast subscription, and PTP clock status. Everything you need to validate a cross-machine path at a glance.

Per-channel peak/RMS · peak-hold · clip · pkts/sec
F.10

One-click presets and a built-in test tone

Network profiles configure the latency-versus-robustness trade in a click, and a built-in tone generator lets you verify a path with no input device or microphone permission needed.

Profile · 01
Wired AES67

Strict 1 ms ptime, shallow buffer. Lowest latency on gigabit.

Profile · 02
Studio LAN

Balanced packet size and buffer depth for a busy wired house network.

Profile · 03
Audio Snake

Larger packets, moderate buffer — a stage-box-style multicore over one cable.

Profile · 04
Wi-Fi

Small packets, deep jitter buffer. Robust monitor feeds over wireless.

05 / Ways to use it

Where it fits. From stage box to broadcast plant.

Stage · FOH

Low-latency digital snake

Plug an 8-channel interface into a laptop on stage, send all 8 channels to a computer at front-of-house with its own interface — replacing a copper multicore with a single network cable.

Studio · multi-DAW

DAW-to-DAW routing

Move stems, buses, or live feeds between two workstations — or two apps on one machine — without extra hardware or a virtual audio device.

Facility

Studio-wide distribution

Use commodity Ethernet as a lightweight MADI/Dante-style backbone, routing audio between rooms, booths, and control surfaces.

Broadcast

AES67 / ST 2110 interop

Send to or receive from broadcast infrastructure, AES67-capable consoles, and Dante networks (via AES67 mode), or feed a Fairlight system that discovers it over NMOS.

Monitoring

Personal monitor feeds

Distribute monitor mixes to performers' laptops over Wi-Fi, using small packets and a deeper buffer for reliability.

Contribution

Room-to-room over the house LAN

Carry audio across a building's network for overflow rooms, broadcast contribution, or live-to-tape between floors.

NMOS

Orchestrated broadcast workflows

Let a central controller subscribe AoN receivers to senders programmatically via IS-05 — no manual IP wrangling.

Playback

Multi-room distributed playback

Drive several receiving machines from one source for synchronized playback across rooms.

Diagnostics

Test, alignment & troubleshooting

Use the test tone and dual-instance metering to verify network paths, measure clipping, and A/B sender vs. receiver for a byte-clean check.

Why open standards, not Dante

Dante is the de facto standard for installed sound, but it's proprietary — owned by Audinate, with a per-product licensing fee. AES67 is the open ITU/AES standard that Dante itself can interoperate with; SMPTE ST 2110-30 is its broadcast profile; NMOS (AMWA) is the open discovery and connection layer. AoN speaks the open standards directly — anyone can read the specs, and AoN is wire-compatible with every device that follows them. No proprietary NIC, switch, or dongle required.

06 / Technical benefits

Engineered for real, glitch-free production use.

B1 Runs on the network you already have

No proprietary NIC, switch, or dongle. Wired gigabit gives the best latency and lets you use larger packets; Wi-Fi works for monitoring and lower channel counts.

B2 Tunable latency vs. robustness

Packet size and jitter-buffer depth trade latency against resilience — dial in anything from a sub-5 ms wired snake to a deep-buffered Wi-Fi monitor feed.

B3 Glitch-free long runs

The receive-side adaptive resampler slaves the output clock to the incoming stream, eliminating the slow buffer drift and periodic dropouts you'd get from two free-running interface clocks — no shared word clock needed.

B4 Real-time-safe audio engine

The audio thread never blocks or allocates: a lock-free jitter buffer and pre-allocated buffers keep the processing path wait-free, avoiding the priority-inversion dropouts common in naive network-audio code.

B5 Standards interoperability

Native AES67 / ST 2110-30 (L24 RTP), NMOS IS-04 discovery and IS-05 connection management, PTPv2 sync, and SDP transport files mean it fits professional broadcast and AV-over-IP ecosystems — not just its own.

B6 Sequence-accurate, ordered delivery

Packets are reordered by sequence number, late and duplicate packets are handled, and missing audio is concealed — with a hard latency cap that prevents runaway buffering if a clock mismatch develops.

B7 Resilient discovery

Three independent paths — Bonjour, UDP multicast, and a same-host file registry — mean peers still find each other when one path is blocked, plus manual IP always works.

B8 Flexible channel & bus handling

Up to 16 discrete channels independent of the host's bus layout, and an engine that runs send-only or receive-only — so a receive-only machine needs no input device and a send-only machine needs no output.

B9 Self-contained and inspectable

Built in portable C++ — no cloud service, no account, no subscription. The audio stays on your local network.

07 / At a glance

The numbers that matter.

1 → ∞
Multicast · one send, any number of listeners
< 5 ms
Latency on gigabit
16
Channels per stream
2
Wire formats · AoN-native + AES67
PTPv2
Software grandmaster · IEEE 1588
NMOS
IS-04 discovery · IS-05 connection
MIT
License · open source
$0
No fees · no cloud · local-only
08 / Specifications

The full picture.

Plugin formatsAudio Unit (.component) · Standalone app · VST3 and Windows on roadmap
Operating systemmacOS · Apple Silicon and Intel — Apple M-series processor recommended
Channels per streamUp to 16 discrete · independent of the host bus layout
Wire formatsAoN-Native (32-bit float, 20-byte header) · AES67 / ST 2110-30 (RTP V2 + L24 big-endian, 1 ms ptime)
ModesOff (pass-through) · Send · Receive · switchable at runtime
Network profilesWired AES67 · Studio LAN · Wi-Fi · Audio Snake · plus Custom
Jitter bufferConfigurable depth · lock-free · adaptive sample-rate converter for clock-drift compensation
Loss handlingSequence reordering · duplicate/late handling · fading packet-loss concealment · hard latency cap
ClockBuilt-in PTPv2 (IEEE 1588-2008) · master / slave / BMCA · auto-elects or slaves to existing grandmaster · RFC 7273 timestamps
DiscoveryBonjour (mDNS/DNS-SD, _aon._udp) · UDP multicast · same-host registry · manual IP fallback
NMOSIS-04 node (discovery) · IS-05 Connection API · transportfile SDP · HTTP on port 8042 · _nmos-node._tcp
Latency< 5 ms end-to-end on gigabit Ethernet · Wi-Fi supported with relaxed timing
Metering16-channel meter bridge · per-channel peak/RMS · peak-hold · clip indicators · packets/sec, latency estimate, PTP & multicast status
Test toneBuilt-in generator · verify a path with no input device or microphone permission
SDP exportOne-click .sdp export for hand-off to hardware receivers
Engineportable C++ · real-time-safe (no allocation/locking on the audio thread) · from-scratch PTPv2
PrivacyLocal network only · no cloud service, account, or subscription
LicenseMIT · open source · free
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AudioOverNetwork

AES67 / ST 2110 audio-over-IP between DAWs. Sub-5 ms on gigabit. MIT-licensed, open source.

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LICENCE
MIT — free and open source
ACTIVATION
None — no key, no account
STATUS
Public beta · 0.2.0
ARCHITECTURE
Universal — Apple Silicon and IntelAPPLE M-SERIES RECOMMENDED

AudioOverNetwork is released under the MIT licence: free to download, use and modify, with no licence key and no account required. It is currently a public beta at 0.2.0. AudioOverNetwork is an original Dreamlab Digital Media product. It is not affiliated with, endorsed by, or derived from any hardware or software manufacturer. Specifications are provisional until release.