Introduction

This manual is a revised version of the "Sound Embedded Manual " and is written targeting the sound driver version 2.20.

This manual has detailed explanations for those who program all of the sound controls by themselves, but you can easily create sounds using the "Sound I / F Library" of the program library provided by SEGA. There is also a way to incorporate it. Please use that as well if necessary.
Please refer to "Sound I / F Library User's Manual " for the contents and usage.

1. "P4 Priority level (0-31)" of the unsupported function "Sequence Start Command (01h)" described in the previous manual is not supported even in Ver2.10.

• Volume calculation is faster. However, the algorithms are incompatible.

• Improved that fade or volume change only responded at note off timing. Smooth changes are possible.

• Compatible with damper pedals.

• If FM is forcibly crushed, noise will be generated, so the sound of FM sound source will be restricted. It turns out that this happens when the slot currently connected as FM is assigned to another FM immediately after note-off, with the release remaining. When this slot is a carrier, the volume becomes abnormal, and when it is a modulator, the tone becomes abnormal. This issue is addressed by not letting it be used as an FM slot until the release level drops to some extent (current level is 4 out of 8 and it takes a considerable amount of time to complete the release, so in fact Can't be). However, this leaves the possibility of violating the specifications up to now that "always give priority to late arrival", and although it is a rare case, the pronunciation will be canceled if the note is on by all slot FM. This will return an error (see the error status section), but directors should be careful when designing specs.
  Also, due to the complexity of slot checking, if you use a lot of FM sound sources, the operation will inevitably slow down.

• Until now, drivers used to make a note-off decision as to whether a slot was empty, but now it is decided at the release level. View Release The program is running within LEVEL 2 INT. The pronunciation procedure is as follows.

  step 1

  Find and assign a slot that is keyed off and has a release level of 4 or lower. If a slot that meets this condition cannot be detected, proceed to step 2.

  step 2

  Find and assign a slot with the same pronunciation control number that is keyed off. If a slot that meets this condition cannot be detected, proceed to step 3.

  step 3

  Find the same pronunciation control number from the youngest slot number and use it forcibly. If a slot that meets this condition cannot be detected, proceed to step 4.

  step 4

  The slot that was keyed on in the past is searched for and forcibly assigned regardless of the pronunciation control number. Passing through this routine is basically an error because it exceeds the maximum polyphony. However, the slot being used as an FM sound source is not used. Only at this time will the pronunciation be cancelled. be careful.

• Eliminates petit noise when changing maps.