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Subject: Re: [ModularSynthPanels] Re: JH Varislope Filter Panel

From: Scott Juskiw <scott@...>
Date: 2009-06-19

Thanks Dave, that looks good. I like the waveforms around the WAVE
knob and moving the Clean/Dirty switch in line with the APF/LPF
switches. You don't think the AUX pot and jack are too close? I find
the biggest annoyance with designing a circuit is getting everything
to fit nicely into a panel. It always seems that you've got just one
jack or pot too many (i.e. if that AUX pot wasn't there then the two
invert switches could be moved in line with all the other switches).
Oh well, I'd rather have the option than not.

I'll post a schematic of my circuit mods once I get this built (not
that you need it, the mods are quite simple, but maybe someone else
would like it). Maybe we'll see a BrideChamber version of this
someday. Is there a 5U big-knob version of this coming down the pipes?
(nudge nudge Bill & Will)

On 19-Jun-09, at 2:37 PM, djbrow54 wrote:

> Nice set of enhancements. I agree with them all. I was working on
> a 3U panel myself with the small potentiometer spacing but like
> yours better. I adapted a version of it in FrontPanelExpress at
> http://modularsynthesis.com/jhaible/varislope/varislope.htm
>
> I've used this smaller control spacing on my YUSynth fixed filter
> bank with a switch in between. It's tight but very usable. There is
> a photo at the bottom of this page showing the spacing.
> http://modularsynthesis.com/yusynth/ffb.htm
>
> Nice work. - Dave
>
>
> --- In ModularSynthPanels@yahoogroups.com, Scott Juskiw <scott@...>
> wrote:
>>
>> I plan to build the JH Varislope Filter in July and have been putting
>> together a few modifications as well as trying to figure out a panel.
>> 1. Add a summing amp to support 3 inputs with 100K log pots.
>> 2. Add an inverter to the MOD1 input so that the FM1 pot is a
>> reversing attenuator.
>> 3. Skip the MOD3 input (3 external mod inputs is more than I need).
>> 4. Add a driver to the LFO output that will support a bicolour LED
>> (like MOTM-320).
>> 5. Skip the bypass switch, I've never needed one on a filter.
>> 6. Skip the output pot, I've never needed one on a filter.
>> 7. Change the output driver so that the Mix/Filter switch is not
>> required to completely silence the Dry signal from the output.
>>
>> These modifications require 4 op-amps. It'll fit nicely onto a MUUB-4
>> board, spookily enough.
>>