[sdiy] More on Xpander modes was Re: HP from LP ?

rsdio at audiobanshee.com rsdio at audiobanshee.com
Tue Aug 1 10:25:14 CEST 2017


I am very interested in your GR-300 project, and look forward to the video.

Brian Willoughby


On Jul 31, 2017, at 4:48 PM, David Moylan <dave at westphila.net> wrote:
> I'm working on this in a Roland GR-300 but the boards could theoretically work in any synth that uses the IR3109, like the SH-101 and MC-202.  Not sure how much room is available inside those, the boards are 1.3" x 2.6" using 3 SOIC chips, a small number of 1206 SMT resistors and the rest through hole.  Not very difficult to solder.  The filter selection is via a pot into a 3 bit ADC, and the first filter pole is switched manually. (Haven't had any problem with pops when switching that pole.)  That gives the 16 combinations, of which, there's one duplicate so you get 15 modes.
> 
> If you're interested in a board let me know.  I should have a video on YouTube later this week showing it's operation in the GR300.  Will post here.
> 



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