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#26 2011-04-08 14:10:10

neal beard
Nibbler
From: Portsmouth
Registered: 2010-10-19
Posts: 43
Website

Re: The Feedback mod

DjFluorescent wrote:

What do you mean activate? You mean just simply turning it on? or do you just not perceive it doing anything when it on? All the MIX does it sends the audio in thru the filter. If the input is grounded it will do nothing.

Hi thanks for reply.

I was going on apha's mod page where it said...

"While MIX IN is activated, the feedback loop creates subtle effects in P64 Bass Line.

When MIX IN is disabled, the feedback loop creates a distorted overdrive effect.
(great for giving your acid lines some crunch!)'

http://www.bigmech.com/misc/c64mods/feedbackloop.html

So I guess yes, my question is

How do you route the audio in though the filter in Mono Synthesizer...?

Last edited by neal beard (2011-04-08 16:02:05)

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#27 2011-04-13 13:56:20

neal beard
Nibbler
From: Portsmouth
Registered: 2010-10-19
Posts: 43
Website

Re: The Feedback mod

neal beard wrote:

DjFluorescent wrote:

What do you mean activate? You mean just simply turning it on? or do you just not perceive it doing anything when it on? All the MIX does it sends the audio in thru the filter. If the input is grounded it will do nothing.

Hi thanks for reply.

I was going on apha's mod page where it said...

"While MIX IN is activated, the feedback loop creates subtle effects in P64 Bass Line.

When MIX IN is disabled, the feedback loop creates a distorted overdrive effect.
(great for giving your acid lines some crunch!)'

http://www.bigmech.com/misc/c64mods/feedbackloop.html

So I guess yes, my question is

How do you route the audio in though the filter in Mono Synthesizer...?

found it  - the EXT button in the filter section.

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#28 2011-04-28 16:31:47

neal beard
Nibbler
From: Portsmouth
Registered: 2010-10-19
Posts: 43
Website

Re: The Feedback mod

As I'm new to Mssiah I decided to make breakout boxes for my mods to experiment, before I start drilling my C64.

Here's a pic of my breakout box with audio in/out, vid out and feedback pot. It uses a 500k lin pot with dpdt switch to enable/disable.

Thanks to all for sharing the info...

http://1.bp.blogspot.com/-QB4sNLSSeQg/TblGTksjIII/AAAAAAAAAKA/9UBsEmtXu5M/s1600/MSSIAH2.JPG

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#29 2011-08-10 10:17:51

neal beard
Nibbler
From: Portsmouth
Registered: 2010-10-19
Posts: 43
Website

Re: The Feedback mod

I put a switch in mine to ground audio in when feedback is not used which works great so it got
me thinking along the same lines as you...

perhaps combing audio  in ground and feedback with the pot

did you try it?


krosov wrote:

What if you would combine the two needs, being the feedback and grounding?

I will try the following with a 500 log pot:

leg 1: to Ground: The more the knob will be turned counter clockwise, the more the audio input will be grounded.
leg 2: this will go to the audio input.
leg 3: to Audio out, via a 1K resistor The more the the knob will be turned clockwise, the more it will feedback.

I choose a log pot, since audio volume on a logarithmic scale is perceived as linear. This will thus address the issue that dschohennes reported.
The 1K resistor will work as a current limiter, and prevents damaging the SID.

I expect that this setup will enable me to gradually fade from clean tot distorted. I'll keep you guys posted!


@teenager: did you choose the right pin as the audio output of the second SID? I would guess you might have shortened the audio output to another pin.

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