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Hello guys
I have a question...
Is it posiible to Use USB TO HOST and Classical 5 pin midi in out simultaneously in my Yamaha CP4 ?

I have a project to illuminated LEDs for keys controlled by Rapberry Pi. Rapberry Pi have a program for writing midi in it.
I connect Classical 5 pin midi to my computer to play VST sound and USB TO HOST is connected to my Raspberry Pi to to control my led strip.
When I Connect my piano through Classical 5 pin midi cable to computer everything is working good but when i I turn on the raspberry connected to my Piano with USB to Host cable I lost mIDI connection to Computer.

Is there a way to use my VST sound during recording Midi to my Rasperry ?

Best regards
Jacob

No. Some instruments permit this, but usually not Yamahas. From the CP4 manual:

Maybe not possible to use USB TO HOST to RPi at same time as 5 pin midi to PC, but there may be other ways to do what you want. For example, you could use USB TO HOST to RPi, and set things up on the RPi to forward the midi messages on to the PC. In this case the RPi is functioning as the midi host and you would also connect a usb cable between it and the PC. Alternatively, there would be a way to do the opposite, drive the PC with 5-pin midi (or USB TO HOST) and have the PC forward the midi message on to the RPi. If the PC is the one one producing the sound, I think the second of these (drive PC directly) would be the way you'd want to go, forwarding on to the second machine will add a little more latency.

To add to my previous message:

If connecting keyboard directly to the RPi:
On the RPi (or Linux in general) you could use the aconnect command line utility to connect things up so the incoming midi messages are forwarded from the RPi to the PC. You can get some basic info about this from this page: https://neuma.studio/rpi-midi-complete.html

If connecting keyboard directly to PC:
If your PC is running Linux, then aconnect info in link above would also apply. Not exactly which utiities you'd use to forward things if on Windows or MacOS. Actually, on Windows I think a free tool called LoopMIDI might be useful. If on the PC you have an external interface for the 5-pin midi with multiple connections, it's also possible that interface might send the incoming message out on a different port. Not sure about that, though. If the interface has only 5-pin connections , might still work by running a 5-pin midi to usb midi cable from PC midi interface to the RPi.

Looks like there are MIDI splitters for the 5 pin MIDI.

That could feed the same signal to two devices.

And of course USB-MIDI cables exist too, so the devices don't need to support 5 pin MIDI.

There is no need for convoluted solutions like MIDI splitters or for using serial MIDI next to USB. Just connect the CP4 to the personal computer via USB and use MIDI over Ethernet software to route the second MIDI channel to the Raspberry Pi over the network. The Pi is a personal computer too, they can talk to each other.

Ooh...wireless. 😎

"Convoluted solutions" could be used to have a standalone piano with whatever key lighting the OP is envisioning. So, it could work without a computer. (Apart from the Raspberry PI computer of course)

Thank you guys for your responses. Unfortunately I am not good with programming, I am only an ordinary pianist :P so I will try one of the Midi Splitters. Maybe this is the solution I am looking for

I will try this one, I hope it will work:


https://www.amazon.com/MIDI-Solutio...+-+THRU+V2&qid=1614204276&sr=8-3

Yes a MIDI thru is typically made to duplicate a MIDI signal.

I'm just uncertain how to connect it all correctly. It will be something like that? : 5 pin MIDI Cable from my Yamaha to Midi Splitter and then two Midi to USB cables from my Midi Splitter to connect it separately to my Raspberry and Computer ?
This cables will be ok ?:

https://www.amazon.com/LEKATO-Conne...usb+cable&qid=1614257833&sr=8-10

Thanks for your responses

This cable would be OK between one thru output of the box and the computer. I don’t know this model however. Cheaper than a M-Audio MIDI sport UNO, but more expensive than a noname 5$ and non reliable adapter.

Between the piano and the Input of the midi-thru, this type of cable :

https://m.thomann.de/fr/pro_snake_midi_cable_5.htm

Between an output (thru) and the Rasberry, I suppose the USB-MIDI cable you propose is ok.

Do you recommend this purchase so that everything works as it should or is it an unnecessary expense ?:

https://www.amazon.com/Roland-UM-ON...UM-ONE+MK2&qid=1614292059&sr=8-1

Thanks again for your help

I know that the M-Audio Midi Sport Uno is USB Class compliant. It could be worth if you use a fancy system (Raspberry). If the Roland needs a fancy driver, you may have some trouble. I don’t know how behaves the Roland.

I would definetely say the Roland has way more probability of working flawlessly than even the M-Audio And both will surely work better than one of these brandless converters. The one on the link above (the one costing $17-ish) may be OK, but to be sure, I would buy either the Roland or M-Audio (in that order).

I regret to this day giving awat my Ediroll (which was bought by Roland).

AFAIK, every 5-pin-to-USB interface ever made is class compliant (at least I'm not aware of any that ever needed a driver installed on a Mac, though a driver may be provided for additional capabilities). However the M-Audio Uno is known to have issues with some Yamaha keyboards (I don't think any other M-Audio has the problem including the Sport.) The fact that old Yamahas may be quirky in their MIDI would sway me further away from using a no-name/generic interface if you've got an old Yamaha. In current models, I'd stick with a Roland UM-ONE or iConnectivity mio 1x1.

From the Linux kernel source :


The source code is plenty of « if this is such a device then ... ».

We have a specific Yamaha function (snd_usbmidi_detect_yamaha),and the corresponding Roland (snd_usbmidi_detect_roland)...

This makes me doubt of the compliance of a USB-MIDI device by default.

This sounds like a chicken-and-egg situation. Regardless of whether devices are written to spec or the spec was written to allow for for certain devices, the result remains, I've never heard of any 5-pin-to-USB interface that would not work on a given computer unless an interface-specific driver were installed.

It is not a chicken and eggs. In Nov 1999, we have got a standard specifications « Universal Serial Bus Device Class Definition for MIDI Devices ». But some USB-MIDI device providers prefer to reinvent the wheel and use their own protocol.

Note : I don’t think EVC2017 is wrong. But before having read him, I was suspicious with the Roland adapter. (I have a Roland controller which get needed driver through Internet before working).

EDIT : i note the M-Audio Uno has a specific function too : &snd_usbmidi_maudio_broken_running_status_ops; Since running status optimisation is used with any chord, the patch is frequently used.

I guess if you go back far enough, you could find something not class compliant. But even the Uno--despite not working with some Yamaha keyboards--is class compliant, and has been since at least 2006.

Controllers and keyboards can definitely not be compliant and can require drivers, I'm talking only about those simple devices that are USB on one end, and a pair of 5-pin DIN connectors on the other. Though even when it comes to controllers and keyboards, lack of compliance is pretty rare. I doubt you'd see an issue with much of anything that isn't 10+ years old.

My Yamaha UX16 needs drivers.