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Post by vangelis on Jan 4, 2015 12:42:02 GMT 1
Hi.
I would like to convert an audio track containing kick drums to MIDI. The audio track is material from samples so it has no noise, and the wave is always the same (except for level). I need to create a simple audio to midi trigger device with only input sensitivity and retrigger distance.
I only need the patching right after the audio out until it is converted to a midi note on signal. The rest is ok.
Thank you
Vangelis
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Post by mindtraveller on Jan 5, 2015 16:18:47 GMT 1
Hi, maybe you can first filter the aduio signal with sufficient many LPFs and HPFs, so that mainly the kickdrum-signal passes the filters. Then you can use a comparator as a 'gate' (connecting filtered audio to Input 1 and the gate lvl to Input 2) Then you can set the High out val to 10 and Low out val to 0 and finally connect the output of the comparator to the Gate input of a Trigger to MIDI module.
Greetings,
Adrian
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Post by mindtraveller on Jan 5, 2015 16:23:25 GMT 1
P.S.: Sry you need an additional Peak Follower after the filters and have to connect its output to the comparator not the filtered audio output: To sum up:
audio -> filters -> peak follower -> comparator(Input 1) -> Trigger to MIDI(Gate)
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Post by vangelis on Jan 7, 2015 19:48:03 GMT 1
Thank you for the help!
I can't figure out what will feed the input 2 of the comparator. (I mean which is the gate lvl?)A simple jpg will help me understand.
I also would like to figure out how to control the level of the replaced sample. how can it follow the original levels?
Thank you again,
greetings from Athens.
Vangelis
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Post by mindtraveller on Jan 7, 2015 20:40:37 GMT 1
Filters: If you want the Kickdrum of your audio to trigger a MIDI-note, use some Lowpass Filters and maybe a high resonance at ~30-50Hz Peak Follower: Transforms the filtered audio (which still consists of periodic waves with freq. ~30-50Hz) to a volume signal. Comparator: If the volume (volume signal) is larger than the value at Input 2 the comparator outputs 10Volts. This will (for some sufficient Gate value) be the case, when a kickdrum is playing because the other frequencies are filtered out. Therefore: If the Kickdrum is playing the Comparator outputs 10V (0 otherwise), thus you can use the comparators output as the Gate signal for MIDI. As the Peak Follower does output the volume of the (filtered) audio you can use its output to control the velocity.  I have not tested it yet, I'm shure there might be several details which don't work this simple but i guess basically it should work. :-) I hope this helps. Greetings from Nuremberg, Adrian |
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Post by vangelis on Jan 8, 2015 22:43:59 GMT 1
Your help was valuable. Job done!!! Thanks Adrian!
Edit: I have added a monostable mod after the comparator and set the pulse length accordingly. I have already tried the trigger on an audio with live drums (kick, snare, and noise!...) and everything works fine with some fine tuning of all controls.
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Post by josephgc on Feb 9, 2021 18:13:44 GMT 1
hi guys, based on the topic I wanted to ask if there is a way to randomize a knob to the beat of the music? I try the module KM_RND-GF_x1 but not say how trigger the module (for now only with the click of mouse  ) |
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