Sequencing CCs in Drambo

wim

@espiegel123 - It took me a long time to notice it, but there's a very small and light numeric readout at the bottom-left of the scope you get on long-press.

espiegel123

@wim said:
@espiegel123 - It took me a long time to find notice it, but there's a very small and light numeric readout at the bottom-left of the scope you get on long-press.

Tx!

uncledave

@wim said:

@rs2000 said:
Set Amount to 0.755 and Scale to 0.38 by double-tapping on each knob and entering the numbers by keyboard.

What's the science behind those numbers @rs2000?

Just for reference, here's how it works:

The Drambo CV uses 0.125 per octave, or 1.00 for 8 octaves, 96 semitones. Zero CV is positioned at C2 (note 48), so C-2 (note 0) is 4 octaves down, CV of -0.5. If we add 0.5 to the CV, all the note values will be positive, with maximum value of 127/96. (Highest MIDI note is G8, note 127.) We need a CC input running from 0 to 1, so multiply by 96/127.

The Scale + Offset module computes

y = Range (Amount * x + Offset)

I set Offset = 0.5, Amount = 1.0, and Range = 96/127 = 0.7559055. The previous example used Range = 1 and Amount = 96/127, so Offset had to be 48/127 = 0.377953. Double tap on the displayed value to enter the precise numbers.

I programmed C's from C-2 to C7, then jumped to G8, and the resulting CC values match the note numbers.

espiegel123

Fwiw, this works to scale c-2 to G8 to 0 to 127

espiegel123

Ha! Uncle Dave posted his solution while I was working out mine. His is more elegant. Same math but fewer components.

wim

Oh man, thank you @uncledave and @espiegel123.
That one was going to be lurking around in my head to solve and was probably going bug me in my sleep. 😂

uncledave

@espiegel123 said:
Ha! Uncle Dave posted his solution while I was working out mine. His is more elegant. Same math but fewer components.

Thanks. Yeah, yours is the same. I just went straight to Scale+Offset because @rs2000 used it. I prefer using the Range because then there's only one magic number, the 96/127.

wim

Another way of looking at it.
[edit] - corrected after @uncledave's response below. 👍🏼

slicetwo

You are all absolutely nuts. Fantastic. Thank you for all the feedback and setups!

wim

This was worth capturing on the Wiki: https://wiki.audiob.us/doku.php?id=drambo_cookbook#sequencing_cc_values_using_notes

rs2000

@wim said:
This was worth capturing on the Wiki: https://wiki.audiob.us/doku.php?id=drambo_cookbook#sequencing_cc_values_using_notes

Thanks! 🤝

uncledave

@wim said:
Another way of looking at it.

I'm not sure how that works. Offset adds the bias to the note, Divide computes the scale factor. But shouldn't Add 1 be a Multiply by the scale factor?

Edit: I suspect you may be feeding the Offset output to the CC generator. The pesky Drambo color coding convention makes it impossible to tell. That would appear to "work" for notes 0 and 127, but not so good over the range. Replacing Add 1 with Multiply, and using its output for the CC does work, as expected.

wim

@uncledave said:

@wim said:
Another way of looking at it.

I'm not sure how that works. Offset adds the bias to the note, Divide computes the scale factor. But shouldn't Add 1 be a Multiply by the scale factor?

Edit: I suspect you may be feeding the Offset output to the CC generator. The pesky Drambo color coding convention makes it impossible to tell. That would appear to "work" for notes 0 and 127, but not so good over the range. Replacing Add 1 with Multiply, and using its output for the CC does work, as expected.

Ahh. Thanks.
I was just trying to set it up to be more visually explanatory of the math, and to avoid entering rounded off numbers manually, but didn't think it through fully, and didn't test well enough.

I've corrected my post and the wiki page.