kogmachine wrote:I read a little about this in an issue of Keyboard. You've piqued my interest. Time to look into this some more.
http://www.johnbowen.com
Current specs include (from John's website):
Oscillators - 4, each osc type selects from standard waveshapes, wavetable (PPG) type, sample playback, CEM (Prophet 5) type, or Prophet VS type. New types can be added as they are developed via an upgrade to the OS. There are 2 frequency mod paths and 2 waveshape mod paths. Linear FM is possible for all osc types through the Mod 1 path. Frequency mod sources include any osc, any filter, the external inputs, or any of the lfos, envelopes, controllers, etc. The Frequency Mod 2 path can be switched to act as a 'sidechain modulation source' for Mod 1 path.
Filters - 4 filters, each hardwired to its own mixer (hence 4 mixers).
Filter types include:
1) all pole possibilities for the Ladder (mini style) filter, including 24 dB Lowpass, Highpass, and Bandpass, 12 dB Lowpass, Highpass, and Bandpass, and 6 dB Lowpass, Highpass, and Bandpass.
2) State Variable Filter - 12 dB Lowpass, Highpass, and Bandpass, and Notch.
3) 24 dB Lowpass modeled on the Prophet 5 Rev1 filter (SSM2040)
4) 24 dB Lowpass modeled on the Rev 3 Prophet 5 (CEM3320)
5) Comb/Tube filter
6) FX such as sweeping EQ, phasers, etc..
New filter types can be added as they are developed via an upgrade to the OS.
There are 3 filter frequency (cutoff) mod paths. Mod 1 can be switched to modulate the resonance; Mod 2 can also be switched to control Mod 1 amount, and Mod 3 can similarly be switched to control Mod 2 amount.
ADSRs - there are 6 standard DADSRs. Each overall amount can be modulated, and each segment can be individually modulated from, Velocity, Keytrack, Mod Wheel, and 4 freely assignable Midi Controllers (CC1-CC4). Also, each segment can have a variable slope, from linear to exponential.
Looping Envelopes - there are also 2 looping envelopes, each with 8 Time&Level segments. There is overall modulation possible of Time and Level.
LFOs - there are 5 identical LFOs, with the fifth being permanently connected to the frequency of all oscs (therefore, it is called the Vibrato LFO). The LFOs have the standard waveshape types, and range from 0-524 Hz at the moment (we could set them higher if needed). There are parameters for Delay Start, Fade In, Fade Out, Rate, Waveshape, Retrigger, Phase, Level Mod and Rate Mod, Midi Clocking, and Offset (offset provides a positive unipolar signal for the lfo outputs).
VCAs - There are several models implemented for the final output stage circuit. Types will include: Linear, Non-Linear "Analog", SSM2020, CA3280 (Prophet 5 Rev3)
Vector Synthesis - There are 2 Vector Mixer sections. The prototype does not show it, but there will be an X/Y Joystick (non-spring loaded) in the leftmost section to provide control for the Vector Mixers.
AM Sections - 2 Amplitude Modulation sections, each of which have Carrier, Modulator, Algorithm and Shaper parameters. Ring Mod is one of the algorithms provided.
Effects - A wide variety of effects will be initially available, such as delay, flanger/chorus, reverb, EQ, etc. As with the other sections, additional FX types such as a vocoder or resonant filter bank will be added as they are developed via an upgrade to the OS.
More to come later.....