Sound Design Challenge - Mod-7 + Vector Synthesis + Karma

Daz · Post by **Daz** » Wed May 06, 2009 7:07 pm

sirCombatWombat wrote: @Dan, All
It has bothered me from the beginning that the EG curve parameter goes only one way; I have no means to put the curve to the negative direction. Or have I missed it? In the LFO section the shape parameter works in both direction and I have found it useful.

On the Access Virus they use the trick of self-modulating the envelope stages with the EG itself to change the curvature. I wonder if you can do the same on the Oasys ? I'd have to look/try later.

Daz · Post by **Daz** » Wed May 06, 2009 7:21 pm

From Howard Scarr/Access Music Virus Programming Tutorial :

p.s. I did throw together a MOD-7 proggie last week, but didn't get round to posting it yet. Will do shortly. It's really more a reflection of things I enjoy doing in MOD-7 than anything else. Thanks for your proggies Kevin, I look forward to checking those out too.

Daz.

Daz · Post by **Daz** » Wed May 06, 2009 7:55 pm

If the Oasys is able to do this then it would be configured like so :

A) Set the Curve parameter for each stage to 0 - Linear

B) Set AMS source to modulate envelope stage time to be the envelope itself (Amp EG in this case)

C) Set the amount of self modulation for each stage.

Daz.

danatkorg · Post by **danatkorg** » Wed May 06, 2009 8:53 pm

sirCombatWombat wrote: It has bothered me from the beginning that the EG curve parameter goes only one way; I have no means to put the curve to the negative direction. Or have I missed it? In the LFO section the shape parameter works in both direction and I have found it useful.

Both curve directions can certainly be useful for LFOs and crossfades. For EGs, I can certainly believe that the opposite directions could be useful in special cases, or for special effects. My guess is that these were omitted for code efficiency (i.e. greater polyphony); I'll look into it.

That said, the provided curve directions (log for attack, exp for decay) are standard for almost all synths. The OASYS EGs are modeled after analog synth envelopes, which naturally produced these shapes through the charging and discharging of a capacitor.

- Dan

danatkorg · Post by **danatkorg** » Wed May 06, 2009 8:57 pm

Daz wrote:From Howard Scarr/Access Music Virus Programming Tutorial :

Daz.

If I'm reading this correctly, the end result is the same as the provided curvatures for the OASYS EGs: convex/log for attack, and concave/exp for decay.

- Dan

danatkorg · Post by **danatkorg** » Wed May 06, 2009 9:01 pm

Daz wrote:If the Oasys is able to do this then it would be configured like so

It won't work this way, unfortunately. Once an EG segment begins, it can’t be modulated. For more info, see page 71 of the Parameter Guide (latest version, E5), under "3–4c: Level Modulation."

There's another way which should work, although I haven't tried it: use an AMS mixer, set to Amt A x B, and use the same EG for both inputs.

- Dan

Daz · Post by **Daz** » Wed May 06, 2009 9:07 pm

Thanks Dan !

Daz · Post by **Daz** » Wed May 06, 2009 9:09 pm

danatkorg wrote:
Daz wrote:From Howard Scarr/Access Music Virus Programming Tutorial :

Daz.
If I'm reading this correctly, the end result is the same as the provided curvatures for the OASYS EGs: convex/log for attack, and concave/exp for decay.

- Dan

I was hoping that because mod depth for time is +/- it would allow you to bend it both ways, as it were

Look forward to hearing how your AMS Mixer thoughts pan out.

Daz.

sirCombatWombat · Post by **sirCombatWombat** » Wed May 06, 2009 9:12 pm

Thank you Daz and Dan!

Daz I tried your suggestion but I couldn't get it to work, apparently the EG modulators take a 'snapshot' value when they are triggered.

Daz · Post by **Daz** » Wed May 06, 2009 9:13 pm

sirCombatWombat wrote:Daz I tried your suggestion but I couldn't get it to work, apparently the EG modulators take a 'snapshot' value when they are triggered.

Dan beat us to that ... I thought he might

sirCombatWombat · Post by **sirCombatWombat** » Wed May 06, 2009 9:24 pm

Daz wrote:
sirCombatWombat wrote:Daz I tried your suggestion but I couldn't get it to work, apparently the EG modulators take a 'snapshot' value when they are triggered.
Dan beat us to that ... I thought he might

Yep

danatkorg wrote:There's another way which should work, although I haven't tried it: use an AMS mixer, set to Amt A x B, and use the same EG for both inputs.

That works!

With values A = 0 and B = 99 the curve sounds opposite to the curve provided in EG envelope. With A= 99 and B=0 it is linear. Adjustment has to be done so that the sum of the two values remain 99, then it sounds (at least to me) correct.

Thanks!

rkarlberg · Post by **rkarlberg** » Fri Jun 12, 2009 5:58 pm

rkarlberg wrote:Ok, I just uploaded my entry to the downloads section... My sound is User bank B - 0013, and there is a .MP3 demo.

Well, seems like my file never made it to the upload section, but I found a place to store it online:

http://www.mediafire.com/?sharekey=f96d ... f6e8ebb871

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Sound Design Challenge - Mod-7 + Vector Synthesis + Karma

Re: Great idea!