#147

the idea is that left is “in phase” with Survey input (so if you put +5v into Survey, or put it full whack, you should see +5v), while right is “fully out of phase” or the inversion of the Survey input.

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#149

Putting something into the LEFT or RIGHT inputs breaks the normalization of the voltage.

I believe the diagram is showing a crossfade between the input to LEFT (a sinewave LFO) and the +5 volts of the RIGHT, which is normalled (no input).

This part from Martin’s Patching Cold Mac explains it a little more:

In both scenarios above, the outputs at RIGHT(OUT) and LEFT(OUT) are affected by the default -5v and +5v signals normaled to LEFT and RIGHT, respectively. If you insert a dummy cable in either LEFT or RIGHT, that will break the normalization and constrain voltage range of the output at RIGHT(OUT) and LEFT(OUT) accordingly. Moreover, you can insert your own signals at LEFT and RIGHT to modulate the voltage range at RIGHT(OUT) and LEFT(OUT).

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#151

I think you have the right idea – LEFT OUT always outputs +5v at full CW unless you plug something into the RIGHT IN. There’s a relationship between LEFT and RIGHT and their normalizations.

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#152

Ah! The offset finally makes sense! I just kept thinking of left and right for audio cross fading OR as inverse voltage sources with nothing plugged in. Never crossed my mind to use offset input to offset an lfo with a constant voltage!

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#153

To fully understand the normalizations/ offset on CM, one of my approach was in use of bipolar voltage indicator like this:

Get three maybe four of this, plug them to the outputs of CM, you would clearly see what goes on and learn much easier.

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#154

Those are handy. I use the scope on my ER-301, you could also use mordax data or dave jones o’tool.

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#156

It would be great to hear a recording of this :slight_smile:

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#157

I was gonna complain that that’s the whole idea behind inverting my ANDs and lagging my slopes,

…and then I realized that translating those kinds of abstract procedures into something that can have a more tangible effect is basically what I study (math), so I guess I’ll just cheer that you did that hard work and found a use case that sounds really sweet!

3 Likes
#159

hahaha I love “a big dumb DJ fader”! it’s too bad they would never put that in their official documentation.

3 Likes
#161

I recently had to sell my MN Maths and been wondering how I could reproduce the Cycle input for my MN Function using the Cold Mac. To be more specific, I wanted to trigger the Function via the Metropolis’ Gate out and also use my ls1LightStrip to activate cycle mode.
Here’s how I solved that using the Cold Mac:

  • Function’s EOC into CM AND 1
  • ls1Lightstrip Gate out into CM AND 2
  • CM AND Out into OR 1
  • Metropolis Gate Out into OR 2
  • CM OR Out into Function Trigger input

Its simple solution but it works great. It should also work with any envelopes that have EOC outputs.

5 Likes
#162

brilliant solution! you got your Cold Mac to say “okay, if Metropolis triggered me, definitely trigger Function. otherwise (or “also”), if both Function’s EOC and the Lightstrip say so, let’s also trigger Function”.

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#163

Exactly :slight_smile: It should reproduce the behaviour of the Math’s cycle / trigger inputs quite well. Not a super fun use of the CM but definitely useful.

#164

Hey sorry for what is no doubt obvious. But to understand the Cold Mac please can you tell me what the horizontal line on the symbol is on the outs? is it 0 Volts?

#165

Yes, i believe it is.

check the doudoroff link for visual representation

#166

haha that’s what I’m on melting my brain

#167

or maybe it is the value or survey… you made me rethink… i am confused now

#168

see now my initial thinking was its the position of survey, if you thing of the lines around the survey know are they then matching say the movement within that frame.

#169

for instance slope in and slope out the sound is only within the inside of that radius

#170

The horizontal line is 0v. The diagonal line in the graphic is showing you the transfer function for that functional block as you sweep survey with nothing patched in. With nothing patched in to Cold Mac, try patching the output of each functional block one by one to the pitch input of an oscillator, and sweep the survey knob slowly from min to max and back. Listen to how the pitch of your oscillator reflects the diagonal line.

Then try using ramp or triangle waves, or any other LFO, to drive the survey input with the knob at 0 (noon) and now you will have 6 synced LFOs, some out of phase or inverted, some at different frequency ratios, depending on what you chose as your source LFO to drive survey.

11 Likes
#171

Thank you V’d⭐️ Ace!