Archive of the former Yahoo!Groups mailing list: Korg Poly800/EX800 Users

previous by date index next by date
previous in topic topic list next in topic

Subject: Re: [korgpolyex] AM Mod?

From: billmeirelles@...
Date: 2011-07-22

There is no risk of feedback, CV means control voltage, it has nothing to do with audio.
Your ideas seams to work, you should give it a try, no extra parts needed but take
it easy with solder iron, if you warm up the chip too much you can render it unusable.


Em 22/07/2011 17:18, 7yash < josh.nursing@... > escreveu:

I was looking at the schematics and trying to understand the FM-800 mod. So I gather that the Osc 1 is routed to P 19 - VCF Cutoff Lin In for FM.

This got me thinking that we could use another pin for amplitude modulation using DCO2, e.g.:

IC 5 - P 7 routed to either:

1. NJM2609 P 9 - VCA Level CV Lin In (risk of feedback here?)
2. NJM2609 P 2 - Mixer Signal 1 Level CV In

2 seems much more fun to me as then, DCO2 could Amp Mod DCO1, which itself routes to the FM Mod.

Is there any additional parts needed than resistors and a suitable potentiometer here?

This would make for some electric piano sounds or more types of sound effects as in those examples:

http://www.propellerheads.se/substance/discovering-reason/index.cfm?fuseaction=get_article& article=part20

Your thoughts?