Mozzi midi input issue

[Felipe Fernández Sobarzo]

Hi,

I'm testing the Mozzi midi input sketch and it looks like the envelope.noteOff() instruction is not doing anything, the sinewave sound keeps playing continuously without stopping the sound.

Any suggestions? 

Thanks,

[Tim Barrass]

Hi Felipe,

is the Arduino LED showing that the noteOff message is being caught by HandleNoteOff()?

Tim

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[Felipe Fernández Sobarzo]

Tim,

Thanks for your prompt response. The light turns off after i release the key, i even commented this part in HandleNoteOff: digitalWrite(LED,LOW);

And it's going into that part of the code, what is not executing is the : envelope.noteOff(); , or at least that's what i think. 

I even tried this:

  if(velocity == 0){

    // some midi controllers send velocity 0 instead of note-off

    envelope.noteOff();

    digitalWrite(LED,LOW);

  }  

and nothing, dunno what could be the problem, i switched to Arduino IDE ver 1.0.5 and only the sound was a bit different.

[Tim Barrass]

Hi Felipe,

I tested the example sketch here with a midi keyboard and it works for me.  I wonder what could be different at your end?

Tim

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[Felipe Fernández Sobarzo]

Tim,

I'm thinking that the 6n137 might be broken or something, i'll test today with another one. I read somewhere that if you connect the wrong pins it can stop working properly, i'm kinda starting with electronics so i'm not sure about this.

Thanks!

[Felipe Fernández Sobarzo]

Tim, 

Do you have the schematics of the Midi IN circuit your are using?

Thanks

[Felipe Fernández Sobarzo]

Tim,

We tested our midi circuit with another synth(Midi simple synth) from the midi lib examples and it worked perfectly. 

I don't know what could be wrong because we are using the same sketches from the Mozzi examples.

Any suggestions ?

[Mr Sensorium]

Hi Felipe,
the midi circuits I've used include a generic one for Arduino, like many that come up in google, and the usb midi input on a Teensy.

Are you getting any error messages or sounds at all?

Tim

[Felipe Fernández Sobarzo]

Tim,

We are not getting any error msg's when we compile, after that we can play a basic oscillator  but when you play a note and then switch to another, it keeps playing a sound, so after playing one note is always playing something. I don't know if it's a sustain/release issue or a problem with noteOff msgs.

We haven't modified the sketch from mozzi so it should work.

[Tim Barrass]

Hi Felipe,

does the arduino led show that midi note on and note offs are being received as you'd expect?

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[Felipe Fernández Sobarzo]

Tim,

It blinks just normally, is the sound that "hangs"  somehow.

[Tim Barrass]

Mmm... it sounds like the release phase of the adsr envelope isn't working correctly, if the note-offs are being registered but the sound won't fade out.

Does it work if you alter the sustain parameter from 10000 to 200?

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[Felipe Fernández Sobarzo]

Tim,

We also changed those values because 10000 looked like a lot, and the sound is still there, we even tried with values that are less than 200.

[Tim Barrass]

Hi Felipe,

I think I found the sound you're talking about - it's a hangover from the adsr not quite reaching 0 at the end.  I've attached a modified ADSR.h - let me know if this works for you.

Tim

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[Felipe Fernández Sobarzo]

Tim,

It works now!, what did you change in ADSR.h and why does this happens?

Thanks a lot!