Vallaren DTR-48 GET SCREAMDRIVER
VALLAREN / PLUG-INS / ScreamDriver
Overdrive · Circuit-modelled · Mono to stereo · AU · VST3 · macOS

One pedal. The whole chain.

A three-stage op-amp overdrive solved from its circuit equations rather than sampled — with a pedalboard bolted on behind it: tube-style compression, magnetic tape saturation, bucket-brigade stereo chorus, pitch-bending tape echo, a spring tank that actually drips, and a zero-latency cabinet loader. Put it on a mono guitar track and it comes out wall to wall.

Get ScreamDriver — $39 See the circuit →
Drive3-stage, circuit-solved
Clipping3 diode voicings
FXComp · Tape · Chorus · Echo · Spring
Price$39
ScreamDriver · One window · No pages
ScreamDriver interface — drive section, super FX row, and cabinet loader
01 / The drive

Solved, not sampled.

Most overdrive plug-ins approximate the curve. ScreamDriver solves the circuit. Every sample, it balances the feedback equation of a three-stage op-amp gain network — the 4.7k/47nF branch, the 51pF stabilising cap, the back-to-back clipping diodes — using Newton-Raphson iteration until the node voltages settle. That is why it behaves like a real pedal rather than a curve: roll your guitar volume back and it cleans up, dig in and it bites, and the op-amp's finite slew rate softens pick attack at high gain the way real silicon does.

Why it matters

Dynamics, not shape

A static transfer curve sounds the same however hard you hit it. A solved circuit does not — the operating point moves with your playing, so the pedal responds to your hands instead of just colouring your signal.

Diode voicings

Three ways to clip

Silicon for classic symmetric squash, asymmetric for touch-sensitive amp-like grind, LED for loud, open, high-headroom crunch.

Bass modes

Three low-end curves

A 720 Hz corner for tight, mid-forward bite; 339 Hz to thicken single coils; 154 Hz to let drop tunings through the drive stage intact.

Tone stack

The real network

The 723 Hz and 3.2 kHz analogue tone network, modelled as a network rather than an EQ, with a taper that puts the sweet spot where your fingers expect it.

Oversampling

4× and 8×

Polyphase IIR filtering keeps the top end silky instead of fizzy, at constant latency whichever rate you pick.

Slew limiting

Finite, like real silicon

The gain stage cannot rise infinitely fast. Modelling that limit is what rounds off pick attack at high gain instead of letting it turn brittle.

Analogue dry path

True bypass

The dry signal is never resampled or filtered on its way through, so blending stays phase-coherent at any mix setting.

02 / Squeeze and saturate

A tape machine behind the drive.

Compression

Before the diodes

A tube-style squish with automatic make-up gain, placed ahead of the drive stage so sustain and bloom arrive before the diodes ever see your signal.

Tape saturation

Magnetic hysteresis

Genuine Jiles-Atherton hysteresis solved per sample — program-dependent squash, head-bump low end, and bias-driven even harmonics. The loop is the sound.

Order

Comp into drive into tape

The chain is fixed on purpose. Compression feeds the circuit, the circuit feeds the tape stage, and each one behaves differently for being in that position.

03 / Super FX

Three ways to get huge.

Chorus

The wide one

A bucket-brigade voice running the classic stereo trick: dry plus wet to the left, dry minus wet to the right. Shimmering and enormous, and it collapses cleanly to mono.

Time / Echo

The tape one

Turn TIME while it repeats and the echoes bend pitch like tape spooling up. Head-loss damping darkens every repeat. One sweep takes you from slapback to self-oscillation, 80–900 ms.

Spring

The drippy one

A modelled spring tank rather than a hall in disguise. Dispersion smears pick attack into the classic chirp, and the right tank is detuned from the left so the splash wraps around your head.

Runs mono to stereo — put it on a mono track and it spreads wall to wall

04 / Cabinet

Drop an IR. Done.

Drag any impulse response onto the cabinet slot and the built-in zero-latency convolver rolls off the fizz the way a real twelve-inch speaker does. Your IR is saved with the session, so a reopened project sounds like the one you closed. No separate amp simulator needed — this is a complete guitar chain in one window, and it is resizable and aspect-locked at any size.

Pairs with

Impulse Lab

Build your own cabinet responses — design a space or capture a real one — then drop them straight onto ScreamDriver.

05 / At a glance

The specs.

3stage
Drive circuit
3
Diode voicings
3
Bass modes
4×/8×
Oversampling
80–900ms
Echo time
0ms
Cabinet latency
AU·VST3
Formats
$39
Perpetual licence
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ScreamDriver

Circuit-modelled three-stage overdrive with tube-style compression, tape saturation, BBD chorus, pitch-bending echo, spring tank and a zero-latency cabinet loader.
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FORMATS
AU · VST3
ARCHITECTURE
Universal — Apple Silicon and IntelAPPLE M-SERIES RECOMMENDED
SECURITY
Signed and notarised by Apple
REQUIRES
macOS 10.13

ScreamDriver is an original Dreamlab Digital Media product. It is not affiliated with, endorsed by, or derived from any hardware or software manufacturer, and it does not model or emulate any specific third-party pedal, amplifier or effect unit. Full licence terms at dreamlabnet.com/daw2/eula.html.