Full USB command specification:

Switching to 2-channel mode:
======================
Request Type: 0x21    // CTRL_OUT | CTRL_TYPE_CLASS | CTRL_RECIPIENT_INTERFACE
Request: 0x1
Value: 0x400
Interface Index: 0xE00
Data:  01 01
Data Length: 2
======================

Switching to 4-channel mode:
======================
Request Type: 0x21    // CTRL_OUT | CTRL_TYPE_CLASS | CTRL_RECIPIENT_INTERFACE
Request: 0x1
Value: 0x400
Interface Index: 0xE00
Data:  01 02
Data Length: 2
======================

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https://bugs.launchpad.net/bugs/1192458

Title:
  [USB-Audio, playback] 4-channel mode don't work on E-MU 0204 USB

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