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From Final Fantasy Inside
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== Record format ==
struct InstrumentIndexAkaoInstrumentAttr
{
/* offsets */
uint32_t attack_offset addr; // offset to attack part of instrument (SPU hardware address) uint32_t loop_offsetloop_addr; // offset to loop part of instrument (SPU hardware address)
/* ADSR Envelope settings */
uint8_t attack_ratear; // ADSR: attack rate (0x00-0x7f) uint8_t decay_ratedr; // ADSR: decay rate (0x00-0x0f) uint8_t sustain_levelsl; // ADSR: sustain level (0x00-0x0f) uint8_t sustain_ratesr; // ADSR: sustain rate (0x00-0x7f) uint8_t release_raterr; // ADSR: release rate (0x00-0x1f) uint8_t attack_modea_mode; // ADSR: attack mode
// 0x05 - (exponential)
// 0x01 (default) - (linear)
uint8_t sustain_modes_mode; // ADSR: sustain mode
// 0x01 - (linear, increase)
// 0x05 - (exponential, increase)
// 0x07 - (exponential, decrease)
// 0x03 (default) - (linear, decrease)
uint8_t release_moder_mode; // ADSR: release mode
// 0x07 - (exponential decrease)
// 0x03 (default) - (linear decrease)
