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 Instrument Block

 The instrument block consists of a number of 16 byte records. The exact
 number of records can be found in the CMF header. Each record gives FM
 characteristics for each instrument as follows :-

 ---------------------------------------------------------------------------
   Offset  |  Usage
 ----------+----------------------------------------------------------------
    00     |  Modulator sound characteristic
    01     |  Carrier sound characteristic
    02     |  Modulator scaling/output level
    03     |  Carrier scaling/output level
    04     |  Modulator attack/decay
    05     |  Carrier attack/decay
    06     |  Modulator sustain/release
    07     |  Carrier sustain/release
    08     |  Modulator wave select
    09     |  Carrier wave select
    0A     |  Feedback/Connection
   2F-33   |  Reserved for future use
 ---------------------------------------------------------------------------

 Sound Characteristics
   Bit 7     | Pitch Vibrato (AM)
   Bit 6     | Amplitude Vibrato (VIB)
   Bit 5     | Sustaining Sound (EG-TYP)
   Bit 4     | Envelope Scaling (KSR)
   Bit 3 - 0 | Frequency Multiplier (MULTIPLE)

 Scaling/Output Level
   Bit 7 - 6 | Level Scaling (KSL)
   Bit 5 - 0 | Output Level (TL)

 Attack/Decay
   Bit 7 - 4 | Attack Rate (AR)
   Bit 3 - 0 | Decay Rate (DR)

 Wave Select
   Bit 7 - 2 | All bits 0
   Bit 1 - 0 | Wave Select (WS)

 Feedback/Connection
   Bit 7 - 4 | All bits 0
   Bit 3 - 1 | Modulator Feedback (FB)
   Bit 0     | Connection