Mono on purpose.

Many tracks hang on one line: a bass that holds the groove, or a lead that cuts through the mix. PRO-1 is a monophonic analogue synthesiser for that line. Two 3340 oscillators feed a 4-pole, 24 dB/octave low-pass filter.

Shape the oscillators

Oscillator A can hard-sync to oscillator B. Each OCTAVE control transposes its oscillator over a four-octave range. LO FREQ moves oscillator B into the sub-audio range, around 60 Hz and below. Pulse width sets the harmonic content of the pulse wave.

Route modulation two ways

Take the filter envelope, oscillator B or the LFO as a source. Send each one DIRECT to its target, or through WHEEL so the mod wheel sets the depth. Targets include oscillator frequency, pulse width and the filter.

Sequence it, patch it, mount it

Two 64-note sequences and an up or up/down arpeggiator play the line for you. A patch bay with 3.5 mm jacks adds CV for cutoff, resonance and oscillator pitch. PRO-1 is 80 HP wide in Eurorack format, with MIDI and USB for your setup.