// [cr, mr, mi, atk, dec, sus, rel, fb, c_wave, m_wave,
//  trem, vib, ksr, ksl, mod_lvl, eg_type,
//  m_atk, m_dec, m_sus, m_rel, m_eg_type]

// cr/mr:     carrier/mod frequency ratio (0.5, 1-15)
// mi:        modulation depth in radians (0-12.566)
// atk/dec:   attack/decay time in seconds
// sus:       sustain level (0-1)
// rel:       release time in seconds
// fb:        modulator self-feedback in radians (0-12.566)
// c/m_wave:  0=sine 1=half-sine 2=abs-sine 3=qtr-sine 4=noise 5=tone+noise
// trem:      tremolo depth at 3.7 Hz (0-1)
// vib:       chip vibrato depth at 6.4 Hz (0-1)
// ksr:       key-rate scaling (0-1)
// ksl:       key-level scaling (0-3)
// mod_lvl:   modulator output amplitude (0-1)
// eg_type:   0=sustained  1=percussive