Speaker Data

• Report 0x18 is used to send speaker data

• Up to 20 bytes may be sent at once

• Byte 1 of the payload indicates the length of data, shifted left by 3 bits

• Data must be padded if it is less than the indicated length

• Sound data must be sampled at roughly the proper rate

• Rate can be set during speaker initialization

• Format appears to be 4-bit ADPCM sound