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ideoforms / AbletonOSC

Control Ableton Live 11 via Open Sound Control (OSC)
MIT License
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easy fix for get/volume get/panning in track.py #15

Closed marcobn closed 2 years ago

marcobn commented 2 years ago

Hi Daniel, as promised... Thanks, marco

ideoforms commented 2 years ago

Thanks!

marcobn commented 2 years ago

Hi Daniel, I have another question for you… I noticed that the return values for volume in track or gain in clips is apparently on a linear scale between 0 and 1. Now, the levels in Live are of course on a dB log scale of some sort (-inf to 6 in tracks and -inf to 20 in clips). In this way, 0 dB in tracks returns 0.85, while 0 dB in clips returns 0.4. Any insight? Thanks, marco

Marco Buongiorno Nardelli (he/him) Regents Professor, University of North Texas External Professor, Santa Fe Institute CEMI, Center for Experimental Music and Intermedia iARTA, Initiative for Advanced Research in Technology and the Arts ArtSciLab, ATEC @ the University of Texas at Dallas http://ermes.unt.edu http://www.materialssoundmusic.com

From: Daniel Jones @.> Date: Sunday, October 9, 2022 at 3:51 AM To: ideoforms/AbletonOSC @.> Cc: Buongiorno Nardelli, Marco @.>, Author @.> Subject: [EXT] Re: [ideoforms/AbletonOSC] easy fix for get/volume get/panning in track.py (PR #15)

Thanks!

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ideoforms commented 2 years ago

Hmm, it's a good question. Looking at the track-level volume sliders in Live, it looks like it ranges from -70dB to +6dB. But, the negative portion of this (in dB) isn't linearly mapped to the 0..1 float scale, so it is not as simple as a linear/logarithmic scaling - there's some additional curve going on. I don't see anything in the LOM docs that immediately jumps out as helpful.

What are you trying to achieve?

jln- commented 2 years ago

Hi. If it helps, there's a Max abstraction call M4L.api.db2value that implements the dB to Live parameter linear scale.

Capture d’écran 2022-10-09 à 23 13 04
marcobn commented 2 years ago

Here is a pythonic way to convert Live linear values to dB.

For track volume:

def db2value(db):

conversion from decibel to linear scale in track volume

if db <= 6 and db >= -18:
    return (db+34)/40
elif db < -18 and db >= -41:
    alpha = 799.503788
    beta = 12630.61132
    gamma = 201.871345
    delta = 399.751894
    return -(np.sqrt(-alpha*db - beta) - gamma) / delta
elif db < -41:
    alpha = 70.
    beta = 118.426374
    gamma = 7504./5567.
    return np.power(((db+alpha)/beta),gamma)
else:
    print('out of bounds')

and its reciprocal:

def value2db(vl):

conversion from linear to decibel scale in track volume

if vl <= 1 and vl >= 0.4:
    return 40*vl -34
elif vl < 0.4 and vl >= 0.15:
    alpha = 799.503788
    beta = 12630.61132
    gamma = 201.871345
    delta = 399.751894
    return -((delta*vl - gamma)**2 + beta)/alpha
elif vl < 0.15:
    alpha = 70.
    beta = 118.426374
    gamma = 7504./5567.
    return beta*np.power(vl,1/gamma) - alpha
else:
    print('out of bounds')

For gain in clips

def db4value(db):

conversion from decibel to linear scale in clip gain

db -= 18
if db <= 6 and db >= -18:
    return (db+34)/40
elif db < -18 and db >= -41:
    alpha = 799.503788
    beta = 12630.61132
    gamma = 201.871345
    delta = 399.751894
    return -(np.sqrt(-alpha*db - beta) - gamma) / delta
elif db < -41:
    alpha = 70.
    beta = 118.426374
    gamma = 7504./5567.
    return np.power(((db+alpha)/beta),gamma)
else:
    print('out of bounds')

for the reciprocal, one can retrieve /live/clip/get/gain_display_string. It will return the value in dB. marco

Marco Buongiorno Nardelli (he/him) Regents Professor, University of North Texas External Professor, Santa Fe Institute CEMI, Center for Experimental Music and Intermedia iARTA, Initiative for Advanced Research in Technology and the Arts ArtSciLab, ATEC @ the University of Texas at Dallas http://ermes.unt.edu http://www.materialssoundmusic.com

From: Daniel Jones @.> Date: Sunday, October 9, 2022 at 1:42 PM To: ideoforms/AbletonOSC @.> Cc: Buongiorno Nardelli, Marco @.>, Author @.> Subject: [EXT] Re: [ideoforms/AbletonOSC] easy fix for get/volume get/panning in track.py (PR #15)

Hmm, it's a good question. Looking at the track-level volume sliders in Live, it looks like it ranges from -70dB to +6dB. But, the negative portion of this (in dB) isn't linearly mapped to the 0..1 float scale, so it is not as simple as a linear/logarithmic scaling - there's some additional curve going on. I don't see anything in the LOM docshttps://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.cycling74.com%2Fmax8%2Fvignettes%2Flive_object_model&data=05%7C01%7CMarco.BuongiornoNardelli%40unt.edu%7Ce6eec04a9974480d2bcc08daaa2611fc%7C70de199207c6480fa318a1afcba03983%7C0%7C0%7C638009377755561808%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=EPN9iBj1Zx234qaaquGIazouTkpER%2Fh%2FXoOj6Ok0Zx8%3D&reserved=0 that immediately jumps out as helpful.

What are you trying to achieve?

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