Hello everyone. I have been playing with Brad’s new Tempo LEDs and have managed to make a working prototype for my nanoKontrol. Thank-you @Brad for giving us Tempo LEDs. I understand the original intent was to use this with microcontrollers, but thought this would be useful information and insight to what is currently required to make it work with a nanoKontrol or similar controller that uses CC data to trigger LEDs. It just goes to show you that Cantabile is so versatile and can adapt to all kinds to situations.
Be warned, this is a long post and does get a bit convoluted at times.
Here are the LED’s I decided to use on my nanoKontrol. The CC values are factory default. I did change the MIDI send/receive channel to 12 for my setup.
Next up was to create a MIDI output port for the nanoKontrol
Now the head scratching part.
I had to figure out the tempo binary bit structure.
From Brads LED blog;
Bits 0-3 contain the current beat number
Bits 4-6 contain the current time signature numerator minus 2
Knowing this I could make a binary bit table for time signature & beat number and convert to decimal. I used these decimal values in the output bindings to control the nanoKontrol LEDs On/Off sequence.
2/4 beat 1 = 0000000 = 0
2/4 beat 2 = 0000001 = 1
3/4 beat 1 = 0010000 = 16
3/4 beat 2 = 0010001 = 17
3/4 beat 3 = 0010010 = 18
4/4 beat 1 = 0100000 = 32
4/4 beat 2 = 0100001 = 33
4/4 beat 3 = 0100010 = 34
4/4 beat 4 = 0100011 = 35
6/8 beat 1 = 1000000 = 64
6/8 beat 2 = 1000001 = 65
6/8 beat 3 = 1000010 = 66
6/8 beat 4 = 1000011 = 67
6/8 beat 5 = 1000100 = 68
6/8 beat 6 = 1000101 = 69
Now the states and bindings to turn the LEDs on & off. I used states to switch the time signature. Each state enables or disables its corresponding bindings. The decimal values calculated previously are now used here in the value mapping.
Lastly I created initialization bindings for the LED’s after state changes & transport stops. This is to make sure no LEDs are stuck on.
Hope this helps @richmn and other community members