The following are types of device driver response messages:
Device Capability Response
This message is sent by a device driver in response to a query device capability message (see Device Driver Query Messages). It indicates the basic MIDI capability of the device driver.
F0 00 00 3A 05 01 ii mm 00 F7
ii = Number of sound generators (instruments)
mm = MIDI capability flags
01xx xxxx MIDI input is supported
0x1x xxxx MIDI output is supported
0xx1 xxxx System real-time Timing clocks are supported
Device ID Response
This message identifies the device and is sent by a device driver in response to a query device ID message (see Device Driver Query Messages).
F0 00 00 3A 05 04 b1 b2 b3 F7 b1 = 1st byte of Device ID b2 = 2nd byte of Device ID b3 = 3rd byte of Device ID
This message is provided to permit applications to perform device unique operations such as issuing device-specific system exclusive messages.
Queue Size Response
This message is sent by a device driver in response to a query output queue size message (see Device Driver Query Messages). It indicates the total output queue size in bytes.
F0 00 00 3A 05 02 ll mm 00 F7 ll = Lower 7 bits of queue size mm = Upper 7 bits of queue size (Queue Size in bytes = 00mm mmmm mlll llll)
For example, if the device driver's output queue is 512 bytes in length, the returned data is:
F0 00 00 3A 05 02 00 04 00 F7