Semi-modular monophonic synth
Sweet Berta
One voice, patched your way. Two oscillators, a ladder filter, a sequencer and an arpeggiator, a patch bay of cables, and a spring reverb.
The launch
Free to claimOpens: October 21, 2026 at 12:00 AM UTC. No closing date yet.
Sweet Berta installs with the Ozner Audio app and a free account. Get the app
The gallery
Every side of the panel, as the plugin draws it
HybridNormalled as the hardware is, so it plays with no cable at all; a cable into a jack breaks its normal and reroutes it. Inputs on the left of each group, outputs on the right.
LFO
Adds to the LFO's Rate knob; a stereo cable runs a left and a right LFO, each at its own rate.
Restarts the LFO's cycle on a rising edge; a stereo cable restarts each side's LFO on its own.
Noise sampled at the start of each LFO cycle.
The LFO itself, not scaled by the mod wheel.
Osc 1
Replaces the LFO's pitch modulation; the keys still play osc 1.
Moves osc 1's pulse width (Square and Narrow Pulse).
Osc 1's waveform.
Osc 2
Replaces the LFO's pitch modulation; the keys still play osc 2.
Linear FM: moves osc 2's frequency in Hz, for bells and clangs.
Osc 2's waveform.
Mixer
Replaces osc 1 as the mixer's Osc 1 channel.
Replaces osc 2 as the mixer's Osc 2 channel.
Replaces the noise as the mixer's Noise channel.
Replaces the external audio input as the mixer's Ext In channel; the Ext In knob sets its level. Euro Out into it feeds the voice back through the mixer.
The mixer's noise in the colour Noise Color selects, before its level knob.
The external input's signal, before its mixer level. Cable it to a unit's Sidechain In to key it; the cable's amount is how much is sent.
The mixer's output, its overdrive included.
Utilities
The high-pass filter's input: nothing reaches it until patched.
What the attenuator scales; with nothing in, a constant (+DC).
The high-pass filter's output.
The Attenuator knob times Atten In, or the knob's own level.
Filter
Replaces the mixer as the filter's input.
Moves the cutoff, on top of the knob and everything else.
Adds to the Env Amt knob: the envelope's depth on the cutoff.
The filter's output.
Envelope
Gates the envelope in place of the keyboard; a stereo cable gates each side's envelope on its own.
The envelope, from 0 up to 1.
The envelope upside down, from 0 down to -1.
Output
Replaces the filter as the VCA's audio input.
Opens the VCA further, on top of its mode's level.
What the plugin plays: Board Out, or whatever is patched here instead.
The played note's pitch.
The last note's velocity, or the sequencer's accent while it is on.
High while a key is down, or while an arp or sequencer step is gated.
The finished voice before the volume: Main Out at 0 dB, however the volume is set. Into Ext In it feeds the voice back the same at any volume.
The finished voice, after the VCA and the volume, before any effect.
Pedalboard
What the Pedalboard's effects play: Main Out, or whatever is patched here instead.
The Pedalboard's end: its last effect's output, or Board In with no effect.