Chris Meyer’s trick WavPak for the ModBap Osiris digital wavetable VCO

need to writeThe ModBap Osiris is currently my favorite wavetable oscillator: it has high fidelity, built-in processing such as stack & detune, a suboctave, a VCA, and more. It also allows you to load your own waveforms into it.

This caused me to sample my favorite waves and tricks on my “Monster” Eurorack modular system and load them into the Osiris, so I could take some of my favorite sounds with me on the road in my travel case. I created four banks: East Coast, West Coast, Formants, and Harmonics.

I did not just sample, say, the sawtooth wave of all of my VCOs; I created patches like audio-rate waveform crossfading, processed them through tube VCAs, sent the fundamental plus second or third harmonics of a warm sine through Serge-based wavefolders and rectifiers, and dialed in my favorite sounds on the Livewire AFG, Verbos Harmonic Oscillator, and Xaoc Devices Odessa as well as different formant filters and filter banks.

As fun as the individual waveforms are, the real trick is what I did with the Y axis of the wavetables: Instead of just loading more waves, I filled them with the 2nd, 3rd, 4th, 5th, 6th, and 8th harmonic of the source waveforms. That means as you modulate the Y value, this WavPak smoothly crossfades between different consonant musical intervals to the root (octave, octave + fifth, two octaves, two octaves + third, two octaves + fifth, and three octaves). When layered with a second oscillator tuned to the root pitch - or with the Osiris’ own subharmonic - the result are musical intervals under voltage control. Used with the Osiris’ subharmonic plus its stack & detune algorithm, and now one VCO sounds like three - with custom waves!

This WavPak is currently available for free from ModBap: https://www.modbap.com/collections/wa...

And here is the index to the video above:
00:00 introduction
00:41 East Coast bank
02:00 West Coast bank
03:11 Formants bank
04:07 Harmonics bank
05:34 Y axis tuning tricks
07:00 patch ideas