What is Reddit's opinion of Midi Commander?

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One thing that might work if you have a phone with USB Type C is a USB-B to USB-C cable. Then you can connect the 'brute to your phone and use whatever app can send CC codes.

Maybe something like this? https://play.google.com/store/apps/details?id=it.bordero.midicontroller

Go with Wifi or USB.

If you don't have Wifi your Macbook can create a Wifi network.

If you don't care about cable and want to eliminate latency as much as possible Android can send Midi messages via USB, although I don't know if any app can do it. This app can do it.

External USB controllers can be connected to Circuit without a computer using a MIDI USB Host such as the Kenton MIDI USB Host MkII or iConnectMIDI4 (the iConnectMIDI2 and Keith McMillen Instruments MIDI Expander do NOT work).

Here is PDF that shows you how to build your own MIDI USB Host:
https://www.dropbox.com/s/tg1n9715a6pwv6x/USB%20Host%20-%20Lewis%20Burn.pdf?dl=0

You can use a Raspberry Pi as USB MIDI Host:
https://neuma.studio/rpi-as-midi-host.html
https://stimresp.wordpress.com/2016/02/08/using-a-raspberry-pi-as-usb-midi-host/

You can use a Windows tablet as a MIDI Host:
http://akiatech.com/blog/cheap-windows-tablet-midi-host/

You can use an iPad/iPhone with a CCK and USB hub and route the MIDI using many different apps, including MidiFlow and MidiFire: https://itunes.apple.com/app/id879915554

You can use an Android phone:
https://play.google.com/store/apps/details?id=it.bordero.midicontroller

External USB controllers can be connected to Circuit without a computer using a MIDI USB Host such as the Kenton MIDI USB Host MkII or iConnectMIDI4 (the iConnectMIDI2 and Keith McMillen Instruments MIDI Expander do NOT work).

Here is PDF that shows you how to build your own MIDI USB Host:

https://www.dropbox.com/s/tg1n9715a6pwv6x/USB%20Host%20-%20Lewis%20Burn.pdf?dl=0

You can use a Raspberry Pi as USB MIDI Host:
https://neuma.studio/rpi-as-midi-host.html

https://stimresp.wordpress.com/2016/02/08/using-a-raspberry-pi-as-usb-midi-host/

You can use a Windows tablet as a MIDI Host:

http://akiatech.com/blog/cheap-windows-tablet-midi-host/

You can use an iPad/iPhone with a CCK and USB hub and route the MIDI using many different apps, including MidiFlow and MidiFire: https://itunes.apple.com/app/id879915554

You can use an Android phone:
https://play.google.com/store/apps/details?id=it.bordero.midicontroller