[sdiy]CV-Quantizer/Wavetable Osc and static RAM

[m.bareille at free.fr]

Hi Jason,

I agree with you 1000% about the resolution on morphed wave :)

I have not yet implemented it, but the final version of the Quantix8 will
probably accept 1Mb(128K) or 4Mb(512k) static RAM chips on the same socket
(firmware detection). This will allow the 2048 waveforms for PPG like oscillator
instead of 512 actualy with the actual 1Mb chip, without any changes on data
retention battery life, increase of the pcb size or any other hardware mod :)

On the Quantix8, Bank/wave pots and CVs are sampled by the PIC chip ( 10 bit
adc) and the result is managed by the firmware. Nothing is fixed by hardware
here, so any adress range combinations are possible :
1x512,2x256,4x128,8x64,32x16,16x32,16x16(x2) for a 1Mb chip ...

Cheers,

Marc B.

Papareil Synth Labs
http://m.bareille.free.fr

Selon Jason Proctor <jason at redfish.net>:

> this looks great!
>
> quick question: will there be any facility for increasing the sample
> RAM? with 16x16, there will be the same 16-sample wavetable
> manipulation restrictions as on the Miniwave, which prompted Cary &
> me to make an expansion board.
>
> this isn't just for more waveforms, but to allow smoother wavetable
> transitions. our Miniwave expander board has 32 wavetables x 64
> waveforms, making it effectively a PPG oscillator and therefore much
> more effective at evolving-waveform type stuff.
>
> thanks and good luck with the project
>
> j
>
>
> >Hello,
> >
> >I have uploaded two homemade videos on YouTube of my new module, named  the
> >"Quantix8". It is a RAM CV-Quantizer,/Wavetable ocs module fully editable in
> >real time by MIDIIt is a melt/fusion of an CV-quantiser/Wavetable with a
> MIDI
> >eprom emulator ;)
> >
> >http://fr.youtube.com/watch?v=kMETs31mIJs
> >http://fr.youtube.com/watch?v=sqBdXgT-3eQ
> >
> >This module is in fact quite similar to any eprom CV-Quantizer/Wavetable but
> i
> >have replaced the eprom by a 1Mbit static RAM chip plus a PIC with a
> >consistant
> >MIDI sysex protocol to manage it. The static RAM contain two matrix of 16x16
> >waveforms of 256 samples ( 8 bits)...Waveforms are CV selectable (
> bank/wave).
> >
> >I have also writen a complete wavetable editor software for PC(9x/XP) to
> >transmit/receive waveforms and other parameters.  This software
> >include a 1V/Oct
> >quantized CV scale generator who can compute all the possible scales
> playable
> >with 12 notes and also a more 'classic' waveform generator, morphers, etc...
> >
> >Notes about videos :
> >
> >- i made them with a cheap web cam ...so sorry for the artistic blurrrr and
> no
> >sound...
> >
> >- they have been recorded on the same PC used for the quantix8 demo...It is
> a
> >very old PC( 1Ghz amd) so all midi transmission you can see on those
> >videos are
> >hardly slowed down,at least by a factor of 10 compared to the normal
> >situation!
> >
> >- the scope monitors what's happen on the Quantix8 output
> >
> >- the Quantix8 input ( fast ADC)is driven by a BF generator ( the box on the
> >scope) set for the demo at the arbitrary value of 5KHz ;) As this BF
> >generator do not provide a SAW waveform (sic), i have used a Triangle and
> set
> >the scope to show only the up ramp to parse all the RAM lsb adresses...
> >
> >More to comme on my web site very soon :)
> >
> >Cheers,
> >
> >Marc b.
> >
> >Papareil Synth Labs
> >http://m.bareille.free.fr
> >
> >PS: I repost this email as the first send last nioght see to have
> >not worked...
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