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I believe the dual Schmitt trigger is used in the same manner as the 3v3 to 5v logic converter you mentioned. Although the hex inverter is slightly less accurate in converting to full 5v logic, it still does the job (and is much easier/cheaper to source). I haven't had issues yet with sending MIDI signals, but it could be problematic with longer cables
Sorry to hear its not working, i designed this on an outdated Raspian image so im not sure if the software is hanging from updates. I will look into upgrading my system and test it further
If your phone signal works I don't think it's the audio card. It could be a mono vs. stereo issue, since your phone signal probably outputs stereo and your guitar only has mono. Do you see any signal in the VU meter (like in the photo)? If there is no signal, then try switching the input device under audio settings to 2 channels and see if anything changes. If there is a low signal response, then you will need a signal booster (preamp) between your guitar and the usb adapter.
Sure I'd be happy to help! So just to clarify, you can hear the audio output from PD but not get any audio input? Or just the guitar signal isn't being picked up by PD? If it's the latter case, then most likely you will need a preamp of some sort to boost the signal. Either try using a pedal with a boost or search for "simple guitar preamp" online. I hope this helps, but let me know if you still can't get a clean signal from PD. What adapter are you using? I think it may depend on whether the analog to digital converter has a strong signal coming into it.
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You've got my vote! In addition to Wolfbane's idea of fishing line, you could build one with the reel mechanism to allow for casting/reeling with a locking mechanism
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