[sdiy] Prophet 08 sub oscillator mod?

[cheater cheater]

yes that's a big caveat that you can't controll it from the uC.
but microcontrollers can be reprogrammed right? :))

On Fri, Jan 2, 2009 at 9:39 PM, Scott Nordlund <gsn10 at hotmail.com> wrote:
>
> It's probably doable if you don't mind surface mount soldering and finding some place to mount an extra little board.  Assuming the Prophet 08 works more or less like any other analog-ish synth (in that the individual oscillator signals are accessible somewhere), it's just a matter of adding a flip flop for each oscillator.  You could easily cascade these for more sub-octaves, and use enable or reset pins to switch it on and off.  You've also got to work out the signal levels, buffering, mixing, etc.  Since no one (to my knowledge) has done any Prophet 08 modifications or posted schematics, you'll just have to go at it with an oscilloscope and figure it out yourself (shouldn't be too difficult).  It will take a fair amount of hardware though (8 dual flip flops and 4 quad op amps?) since you're dealing with 16 oscillators.
>
> There's a disadvantage, though, in that the sub oscillator won't be programmable at all from the Prophet 08 interface, it will be on/off only and independent of the main oscillator level (unless you want to add a bunch of VCAs), and it won't be tied at all to any other features (modulation, etc.)
>
> ----------------------------------------
>> Date: Fri, 2 Jan 2009 18:53:02 +0000
>> From: cheater00 at gmail.com
>> To: synth-diy at dropmix.xs4all.nl
>> Subject: [sdiy] Prophet 08 sub oscillator mod?
>>
>> Hi guys
>> Since the Mopho has the two sub-oscillators, and the Prophet 08
>> doesn't, I bet more people than me have wished it did! So, has anyone
>> considered such a mod? Even if it wouldn't be stored in the patch etc.
>>
>> Is anyone familiar with the new prophet's guts, and if so - would that
>> be a difficult task to add a Mopho style sub?
>>
>> I don't even know if the insides are canned or if they're moddable.
>> Has anyone got pics of the insides? I tried googling, but came up with
>> nothing :)
>>
>> Cheers
>> D.
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