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googlecreativelab / open-nsynth-super

Open NSynth Super is an experimental physical interface for the NSynth algorithm
Apache License 2.0
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Midi input troubleshooting #34

Closed mgiuli closed 6 years ago

mgiuli commented 6 years ago

I'm desperate for some help. I completed build a few days ago and have been unable to resolve the issue on my own. I cannot get any sounds to be made with my synth. I ran a sound test through a command and was able to hear noise out of the headphone jack. That leads me to believe that no Midi signal is reaching the device. I tried using the 64 and 16 GB preconfigured images. With both, everything else appears to function just by plugging the imaged card into my system. The screen functions and shows an expected response when each dial is turned. On the Midi connection, I have tried plugging in a keyboard with 5 pin end on each side (no USB involved) and also tried playing some notes out of a couple of DAWs installed on my PC and connecting with a USB to Midi cable. Are there any diagnostics that I can run to see if a signal is even being received? Is there something additional I needed to do in first setup of the software? Perhaps something else basic that I missed? I don't have much knowledge in this area, so I won't be offended by any suggestions. Thanks in advance!

Wolfberti commented 6 years ago

I have the same problem. All the Inputs are working fine, but I don't get any sounds. I double checked the Soldering for Bridges and measured for wrong Voltages, but couldn't find an error. Are there preexisting scripts to test the MIDI input? Has anybody resources how to write a python script on your own?

Wolfberti commented 6 years ago

Now it gets a little weird. I connected the pi with a keyboard, a hdmi Display and headphones. Now i can Play with the keys from q to p. At least I now know that the dac works. After making sure the MIDI signal reaches the pi, I read some source code, and stumbled over this comment in /app/open-nsynth/src/MidiThreah.cpp 47 // Configure the serial port at 38400 baud. Settings on the Raspberry Pi 48 // should adapt this to the MIDI baud rate of 31250 Could it be,that the raspi is set to the wrong baud rate? Where do you configutre the raspis Baud Rate? Thanks in advance!

mgiuli commented 6 years ago

I've given up for the most part. It may be time to conclude that my board is damaged and I need to find a new one. I did run the dmesg command in console and reviewed the log. This line is the only one that jumps out at me:

2.188288] systemd[1]: [/etc/systemd/system/open-nsynth.service:3] Failed to add dependency on alsa.restore, ignoring: Invalid argument

Can someone please confirm if that's normal or not?

Wolfberti commented 6 years ago

You could try to build the OS from Scratch. I'm currently downloading the 16gb version, if this will fail i will try Building from scratch.

nsynthsuper commented 6 years ago

Hi mgiuli & wolfberti – the preconfigured image will have the baud rate set correctly; this does indeed sound more like an issue with the MIDI part of your hardware build. The easiest way to test the MIDI is to send notes to all channels which you should be able to do via your DAW.

mgiuli commented 6 years ago

Looks like I'll be getting a new board then. Thank you both for the help.

Wolfberti commented 6 years ago

Solution! Connect a 10k resistor between pin 7 of the 6n139 and pin 5(ground).

mgiuli commented 6 years ago

I'm glad that worked for you. I knew it was a long shot for me, but I tried it anyways without success. Thanks again!

mgiuli commented 6 years ago

I wanted to confirm that the fix posted at https://github.com/googlecreativelab/open-nsynth-super/issues/32 did the trick. Turns out I should've hit the keys a few more times before declaring it dead. I hadn't touched it since my last post. Once I heard a sound from it, I knew that fix was worth trying.