[sdiy] Any usefull modifications to fit on an SCI Pro-One?

[Julian]

Hi Tom, 

> One simple but useful modification I did to mine was to hack 
> external jack inputs into the mod panel. I have two jacks on 
> the back that replace the Filter Envelope and Osc B 
> modulations when you stick something in.

It would seem sensible for me to look into those, and adding normalised jacks in some of the other pathways too.

> I'd also recommend being able to clock the sequencer 
> independently of the LFO (The Gate In will do this, but maybe 
> add a dedicated square wave clock for the job), and perhaps 
> if you have MIDI, you might want to be able to sync the 
> sequencer to the MIDI clock, or use the hard sync input on 
> the LFO chip to sync that to the MIDI clock.

I was thining of using the synhouse midijack, but a more comprehensive solution from someone like Laurie Biddulph may be a better
idea.

The sequencer is gone though.  The board was used for spares by the previous owner.  I can source the analogue ics, but the lack of
keyboard scanner etc. is whats prompting me to rack it.
Im aware of the project someones doing to re-engineer a scanner, but, even with this, id still need so much, it wouldn't be
financially viable - may as well just buy a mint pro-one!


> Finally, a Pro-One is about 24" wide, so you've got to get 
> rid of 5" to fit it in a rack. Given that the main PCB also 
> has all the controls, I'm not clear how you're going to pull 
> this stunt off. You're a braver man than I if you go for it.


Again prompted by finances... To replace all the original pcb mount pots would cost more then id want to spend.  Looking at the
schematic, I cant see any crazy values (in fact I cant see anything that's not a simple 100k lin) so I figured on wireing in the
nice cheap, availible, alpha pots throughout.

I don't 100% know the line on which ill cut the pcb just yet.  I need to look closer, as theres a lot of tracks that wont be used
without the scanning etc. so it may not be the most obvious line.  Im confident that it wont be *so* hard though.


I actually have an ms20 in a similar position.  The pro-one I could probably get the parts, but just not at any sensible cost,
whereas the ms-20 is a cosmetic write-off.  I figure on putting them both in identical 3u racks, and bringing evreything to the
front pannel with 3.5mm jacks to match my modular.  The ms-20 will be the easy one though...

Spares released, when im done, will be - 

a pro-one keyboard mechanism (minus keys)
a pro one case, inc front pannel (supprisingly exceedingly clean) minus wood.

a few ms20 keys (a number are dammaged though)
an ms20 right hand plastic side panel
a front pannel

Julian