Precision UNITY mixer in MU?

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hamildad
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Post by hamildad » Mon Dec 03, 2018 7:59 am

KSS wrote: Start with a Q123 standards module. Lose the 440 and you have three jacks to use for unity mixing. Add an on-off-on switch to the octaves for plus-off-minus performance use. Already there for the semitones.
You can mod the Standards to get a unity mixer in cant you? not a fully featured module but I meant to read up on this next year when I can imagine modding what I already have..

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Rex Coil 7
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Post by Rex Coil 7 » Mon Dec 03, 2018 12:54 pm

KSS wrote:Start with a Q123 standards module. Lose the 440 and you have three jacks to use for unity mixing. Add an on-off-on switch to the octaves for plus-off-minus performance use. Already there for the semitones.
I only see two inputs? The diagram of the PCB on page 3 of the datasheet PDF shows two input jack connections.

LINK = https://synthesizers.com/products/q123/q123data.pdf

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KSS
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Post by KSS » Tue Dec 04, 2018 3:44 am

hamildad wrote:You can mod the Standards to get a unity mixer in cant you?
It already is a unity mixer. That's what the ADD Input jack is. Would be easy peasy to add two jacks with a resistor each and have a three input unity mixer. resistros would need to be matched to the others already there, or use a cermet trim.

@Rex Coil 7: The description was not a mod for anQ123 module. It was a description of a new module to answer Tony's question. Starting with a Q123 because it has the things which go well with a unity mixer when used as desired by OP.

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Rex Coil 7
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Post by Rex Coil 7 » Tue Dec 04, 2018 6:03 am

KSS wrote:Start with a Q123 standards module. Lose the 440 and you have three jacks to use for unity mixing. Add an on-off-on switch to the octaves for plus-off-minus performance use. Already there for the semitones.
KSS wrote:@Rex Coil 7: The description was not a mod for anQ123 module. It was a description of a new module to answer Tony's question. Starting with a Q123 because it has the things which go well with a unity mixer when used as desired by OP.
The way it's worded sure makes it sound like you're talking about fiddling around with the Q123.

"Start with a Q123 standards module. Lose the 440 and you have three jacks to use for unity mixing.".

Yep, sure as mud, that sounds like you're saying the Q123 has three inputs to use. Sorry man, but it is what it is.

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cornutt
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Post by cornutt » Tue Dec 04, 2018 3:44 pm

I think what he was saying was, you could take out the A440 oscillator and use that space on the panel for the jacks for an adder. A unity adder is a pretty easy circuit to build; you could do it on a piece of stripboard.
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Post by Dave Peck » Wed Dec 05, 2018 7:03 pm

Well it's three days later and I think I've solved my dilemma of how to easily incorporate a hardware sequencer into my MU synth with KYBD CV summing. This solution works for me, but I don't think it's going to help anyone else who might have this issue....

I use a Nord G2 and Encore Expressionist to control my hardware modular. So I starting thinking about possibly creating a G2 patch that acted like a hardware sequencer, with lots of patch parameters assigned to the hardware knobs & switches on the G2's front panel so it could be 'played' live, like a well designed analog sequencer. It took some head scratching, but it's looking good!

It's an eight step sequencer (I could easily make it lots more) and each step has rotary controls for pitch (quantized) and 'accent' CV, which gets routed to midi 'keyboard velocity'. Each step also has switches for step on/off, glide on/off, and a four-way rotary switch for 2x/3x/4x ratcheting. And for all of these controls, the knob value or switch position data is shown in the row of displays above the eight knobs & switches.

There's also some master controls for start/stop (with automatic reset on start), gate length, glide rate, and a switch to enable recording new notes into the sequencer using the keyboard in real time instead of using the row of eight knobs.

And the eight 'variation' buttons give it eight instantly available 'presets' which affect all settings.

And I think I have figured out how to make a new version that adds lots of direction options (forward, backward, back-and-forth, random) that I'll be able to control live from the front panel controls....

And back to the original problem of summing a sequencer CV signal with a keyboard CV, that problem is now a non-issue because the keyboard and sequencer signals are combined in the G2 and sent to the Encore box as a single midi data stream.

The big litmus test is how well does it work as a real time playable sequencer? Could it actually replace a full-featured hardware analog sequencer? So far, I'd say yes. This thing is a lot of fun. I may be doing more Berlin-ish stuff in the future.

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Post by bwhittington » Wed Dec 05, 2018 7:54 pm

If you are using a Q106, don't forget it has unity mixing with its two 1 v/oct ins. It might be a kludgy work around, but combined with an active mult (or possibly even a passive mult?) and even more cable spaghetti, you might be able to distribute the keyboard signal a few times without buying that extra module.

And on the overkill side of the equation, the Moon 590v modules accomplish this in spades, with selectable unity mixing of up to 12 signals.

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