drkzrg/atmega_midi_x0x_heart

Atmega328 MIDI interface for the x0x heart http://www.openmusiclabs.com/projects/x0x-heart/

MIDI interface for x0x heart

Atmega328 MIDI interface for the x0x heart http://www.openmusiclabs.com/projects/x0x-heart/

One-sided for easy home DIY.

NOTE ON/OFF

The gate pins of the eurorack connector are raised to 5V during the note. The "CV" pins of the eurorack connector are set to 1V/oct pitch control voltage. A pitch scale trimpot can be used to tune the x0x.

Continuous Controllers

MIDI CC	Function
1	Envelope
2	Resonance
11	Accent
65	Slide above 64 / No slide below 64
70	Saw level
71	Square level
72	Decay
74	VCF Cutoff

System Exclusive

MIDI Sysex messages for this device begin with a four-byte prefix of the Sysex status byte, manufacturer ID, model ID and device ID.

F0 sysex start

77 33 manufacturer ID, model ID

xx device ID as set by trim pot

--

Set MIDI Channel

At startup, the MIDI channel of the device is the same as the device ID set with the trim pot.

A seven-byte sysex message can be used to change the channel of the interface.

F0 77 33 xx sysex prefix

00 select MIDI channel parameter

xx new MIDI channel (0 for omni)

F7 end of message

--

Patch Dump Request

A six-byte sysex message can be used to request a dump of the current voice parameters.

F0 77 33 xx sysex prefix

01 patch dump request

F7 end of message

The interface will then send a patch dump sysex message that encodes the current voice parameter values.

F0 77 33 xx sysex prefix

02 patch dump

ee rr aa pp ss qq dd ff

envelope, resonance, accent, slide, saw, square, decay, cutoff (eight bytes)

F7 end of message

This dumped patch data can be used to set all voice parameters by sending it back to the interface.

--

Save Patch

F0 77 33 xx sysex prefix

11 save patch

pp patch number (0-127)

F7 end of message