Question about MIDI Thru #513
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in the wiki it states: from/to can be: umidiN (USB MIDI device, N = 1...4) (the MiniDexed device is acting as a USB host, not as a USB device) Can I use this? : |
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Replies: 3 comments 9 replies
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What would that be useful for? Have you tried it? |
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I have a limited number of hardware MIDI OUT DIN channels (5), So I can connect a MiniDexed DX7 to say MIDI OUT 1 acting on midi channel 1 and have another MiniDexed connected to the MIDI THRU of the first MiniDexed while acting on midi channels 2 - 9 |
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ow.... it is working... |
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Thanks for the clarification and glad that it si working. But what do you mean by
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current flowing thru the midi thru is too low, so I changed this: into this: |
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Thanks for your explanation. Maybe someone can benefit from this in the future. |
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What are you using as a MIDI OUTPUT circuit? The MIDI Spec states it can be used with 3V3 logic systems by using a 33R and 10R resistors instead of the typical 220R used with 5V circuits. This will ensure there is still there required 5mA current loop in operation to activate the receiver's optoisolator. More here: https://diyelectromusic.wordpress.com/2021/01/23/midi-micropython-and-the-raspberry-pi-pico/ But in general with a RPi I've found it advantageous to use a two of the inverters of a 74HCT14 buffer powered by 5V but driven by the Pi's 3V3 TX pin to create MIDI out. This is the approached used in the Clumsy MIDI interface and I've found it works well. It is also a good way to get a hardware THRU port from the RX side. That is what I used in the HD44780 version of my own MiniDexed IO board, here: https://diyelectromusic.wordpress.com/2022/07/28/minidexed-raspberry-pi-io-board/ Kevin |
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Oh, and I should add that if you squint and the GNDs are connected, then actually the output of your 3V3 aware MIDI IN circuit could actually drive both RX pins on both Pis directly... but that is starting to stretch things a little... but it has worked for me in the past when I was being lazy! :) Kevin |
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I used the schematics as in the previous reply. |
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Also, both minidexed dx7's suppose to be midi compatible to other midi devices, both input as wel as output wise. |
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MiniDexed is fully software compatible with MIDI. But the hardware one uses to provided a serial MIDI link is down to the individual. There is a sample serial MIDI IN circuit on the Wiki, but no serial MIDI OUT or THRU, hence me asking what you used that led you to conclude that "the midi thru signal is too weak for the minidexed midi input". From the circuit you've posted, you appear to have provided your own buffer stage and it looks like the fix you've implemented is to swap from 3V3 to 5V operation for your buffer? As I said, it may well be that swapping your 220R resistors for 33R and 10R would also have solved your issue, as these are the recommended values to be used in an output stage for 3V3 operation whilst maintaining the required 5mA current loop for MIDI operation. But as I say, whether MiniDexed is "midi compatible to other midi devices" is largely an exercise for the reader (at least hardware wise)! :) Kevin |
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ow.... it is working...
apparently the midi thru signal is too weak for the minidexed midi input...
sorry, you may remove this entry,...