====== N-SPC (AddmusicK) ======
Community-developed driver created for Super Mario World hacks. Based on the N-SPC prototype with extensions.

===== Instruments =====
Unlike the prototype, this variant uses the standard 6 byte instrument format. It still uses separate instrument and percussion tables, but also adds a 3rd table for song-specific instruments.

===== VCMDs =====

^ VCMD ID ^ Description                            ^ Arguments      ^
|$00      | Phrase Termination/End of Subroutine   |                |
|$01-$7F  | Note Duration                          | (%0yyyzzzz)    |
|$80-$C5  | Note                                   |                |
|$C6      | Tie                                    |                |
|$C7      | Rest                                   |                |
|$C8-$D9  | Percussion                             |                |
|$DA      | Instrument                             | xx             |
|$DB      | Panning                                | %xyzzzzz       |
|$DC      | Panning Fade                           | xx yy          |
|$DD      | Pitch Slide to Note                    | xx yy zz       |
|$DE      | Vibrato On                             | xx yy zz       |
|$DF      | Vibrato Off                            |                |
|$E0      | Song Volume                            | xx             |
|$E1      | Song Volume Fade                       | xx yy zz       |
|$E2      | Tempo                                  | xx             |
|$E3      | Tempo Fade                             | xx yy          |
|$E4      | Global Absolute Transposition          | xx             |
|$E5      | Tremolo On                             | xx yy zz       |
|$E6      | Subloop Start*                         | xx             |
|$E7      | Volume                                 | xx             |
|$E8      | Volume Fade                            | xx yy          |
|$E9      | Subroutine                             | xx xx yy       |
|$EA      | Vibrato Fade In                        | xx             |
|$EB      | Note Pitch Envelope To                 | xx yy zz       |
|$EC      | Note Pitch Envelope From               | xx yy zz       |
|$ED      | Set ADSR/GAIN*                         | xx yy          |
|$EE      | Fine Tune                              | xx             |
|$EF      | Echo Enable Bits and Volume            | %xxxxxxxx yy zz|
|$F0      | Echo Off                               |                |
|$F1      | Echo Parameter Setup                   | xx yy zz       |
|$F2      | Echo Volume Fade                       | xx yy zz       |
|$F3      | Sample Load*                           | xx yy          |
|$F4      | Special commands (1)*                  | xx             |
|$F5      | Set FIR*                               | aa bb cc dd ee ff gg hh |
|$F6      | Write DSP Register*                    | xx yy          |
|$F7      | Invalid                                |                |
|$F8      | Enable Noise*                          | xx             |
|$F9      | Send Data*                             | xx yy          |
|$FA      | Special commands (2)*                  | xx yy          |
|$FB      | Special commands (3)*                  | xx ???         |
|$FC      | Remote command*                        | ww xx yy zz    |
|$FD - $FF| Invalid                                |                |

* Unique to this variant