How hard you play sets how high the synced osc 2 sits: soft notes are round and plain, hard ones tear and bark, with a little envelope sweep on top. Play with dynamics, ghost notes soft and accents hard. Macros: Cutoff, Decay, Body. Macro 8, Master, is the output level.

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 it25–48 of 313
Two saws, one an octave under, into a tiny amp turned all the way up in its dark voice: a huge, woolly wall of bass, the EQ clearing the mud beneath it. Hold roots and power through; the low notes rumble. Macros: Cutoff, Sub, Air. Macro 8, Master, is the output level.
The amp before the filter: Crank sits in the Case between the mixer and the ladder, so a fully driven square and saw are plucked by the filter envelope. Every note bites, then closes down to a dark, chewy growl. Play tight, syncopated lines. Macros: Gain, Cutoff, Decay. Macro 8, Master, is the output level.
A picked rock bass with grind: a square and a saw, a bright pick on the attack, through a compressor's Dirt side for a gritty, even growl that sits in a band. Play driving eighths with a pick's evenness; harder notes click brighter. Macros: Dirt, Cutoff, Squeeze. Macro 8, Master, is the output level.
The classic synth pluck: two saws a hair apart snapping shut through the 24 dB ladder, with a little resonance on the snap and a bright plate behind it. Play quick off-beat chords and arpeggios; harder notes open brighter. Macros: Ring, Bright, Space. Macro 8, Master, is the output level.
A round, woody square pluck at 12 dB that bounces from side to side: delay 1 answers on the left, delay 2 on the right a golden ratio later. Play sparse notes and leave room for the echoes to fill the gaps. Macros: Echo, Feedback, Bright, Decay. Macro 8, Master, is the output level.
A glossy, wide '80s pop pluck: saw and square through a gentle filter snap and a deep studio chorus spread past the speakers. Play bright chord stabs and quick sixteenth figures. Macros: Chorus, Bright, Decay, Space. Macro 8, Master, is the output level.
A soft, nylon-string pluck: a triangle with a little saw for the string, a breath of pink noise for the fingertip, and a 12 dB filter closing as the note rings out in a wooden room. Play fingerpicked lines and broken chords; soft notes stay mellow. Macros: Ring, Tone, Finger, Room. Macro 8, Master, is the output level.
KB VEL OUT into ENV AMT IN: harder notes add up to three more octaves of envelope sweep, so playing dynamics bright and soft notes dark. Velocity has no routing of its own on the voice; this patch gives it one. Macros: Cutoff, Bite, Decay. Macro 8, Master, is the output level.
A plucked, jangling harpsichord: a saw for the 8' string and a narrow pulse an octave up for the 4', thinned through the high-pass filter, each note ringing out and damped fast on release. Play ornamented lines and running baroque figures. Macros: Thin, Jangle, Ring, Hall. Macro 8, Master, is the output level.
A bright, quacking clav: two narrow pulses through a resonant envelope snap, the lows trimmed by the high-pass filter and squeezed even. Play tight sixteenth-note rhythm parts and lift off quickly; dig in for more quack. Macros: Quack, Thin, Squeeze, Decay. Macro 8, Master, is the output level.
The clav with a felt mute on: a pulse and a triangle thumping short and round, all attack and no ring. Play choppy, syncopated comping under a groove, low in the keyboard. Macros: Open, Length, Bite. Macro 8, Master, is the output level.
A clean drawbar organ: two triangles at 8' and 4' with a quick key click, full while held and gone when you let go, spinning through a fast rotating-speaker swirl. Play legato chords and bluesy right-hand lines. Macros: Spin, Click, Upper, Room. Macro 8, Master, is the output level.
A thin, reedy '60s combo organ: a square and a saw an octave up, buzzing through a bright filter and a choppy tremolo. Play stabbing garage-rock chords and a wiry riff high up. Macros: Tremolo, Reed, Speed. Macro 8, Master, is the output level.
A gritty rock organ: drawbar triangles at 16' and 8' pushed into a dirty squeeze, with a slow rotating swirl you can kick up to speed. Play heavy sustained chords and growling low riffs. Macros: Dirt, Spin, Growl, Room. Macro 8, Master, is the output level.
A bell-toned electric piano: osc 1 frequency-modulates osc 2 at the same pitch for the struck tine, the filter closing as each note fades, the sides swaying in a slow stereo tremolo. Play soft, jazzy chords and let them ring; harder notes bark. Macros: Bark, Sway, Ring, Space. Macro 8, Master, is the output level.
A buzzy reed electric piano: a triangle and a soft square pushed into the mixer until they growl, through a bright velocity filter and a gentle volume tremolo. Play soulful two-hand comping; dig in and it snarls. Macros: Snarl, Tremolo, Tone, Room. Macro 8, Master, is the output level.
Warm, shifting square keys: the LFO slowly sweeps osc 1's pulse width against a steady square, and a chorus spreads them wide. Play held chords and slow melodies; the tone keeps moving under your hands. Macros: Motion, Chorus, Bright, Release. Macro 8, Master, is the output level.
Soft keys off an old cassette: two triangles with a slow wow on their pitch, a hiss of hybrid noise, and gritty, wobbling echoes. Play simple, nostalgic chords and lazy melodies. Macros: Wow, Hiss, Echo, Tone. Macro 8, Master, is the output level.
The classic sync lead: +ENV OUT into osc 2 PITCH IN sweeps the synced osc 2 down from 18 semitones above on every note, a vocal tearing attack that settles as the envelope decays. Mod wheel for vibrato. Macros: Glide, Decay, Bite. Macro 8, Master, is the output level.
A warm wooden marimba: a triangle struck by its own fourth harmonic through linear FM, the bar's knock dying fast into a round tone, in a small hall. Play bouncing mallet patterns and rolled chords in the middle of the keyboard. Macros: Knock, Ring, Mallet, Hall. Macro 8, Master, is the output level.
A vibraphone with its motor on: soft triangles ringing long, a quiet octave above for the metal, and a round volume pulse from the spinning fans. Play cool jazz voicings and slow melodies and let them ring. Macros: Motor, Depth, Ring, Hall. Macro 8, Master, is the output level.
A deep tubular bell: osc 1 modulates osc 2 at an inharmonic 3.5 to 1, so each strike blooms with clangy overtones that fade into a long hum in a big hall. Play single notes and slow fifths low down, and let every strike ring. Macros: Clang, Ring, Hall. Macro 8, Master, is the output level.
A tiny wind-up music box: high triangle tines plucked by a faintly inharmonic FM shimmer, small and sweet, in a plate. Play lullaby melodies in the upper half of the keyboard. Macros: Shimmer, Ring, Space. Macro 8, Master, is the output level.

Hybrid