ALS300 Datasheet, PDF (65/66 Pages) List of Unclassifed Manufacturers – Media Audio Controller SPEC

Avance Logic Inc.
AM
FM
ALS300
oMT is only effective for channel 0. For other channels , it is fixed on MT=0.
MT
Modulation frequency (Hz)
0
0.183105468
1
2.014147656
2
3.173828125
3
4.211425781
4
5.126953125
5
5.859317000
6
6.347656250
7
7.080078125
Register 2
Default Value : 00000FFFh
Bit Type
Function
31
R/W Keyboard split point (KSP)
30:28 R/W Pitch Octave (OCT)
27:26 R/W Voice volume adjustment (VVA)
25:16 R/W Frequency number (FN)
15:12 R/W Sustain level (SL)
11:10 R/W Envelop Flag (EF) 00:Attack 01:Overshoot 10:Decay 11: Release
9:0
R/W Envelop Attenuation (EA)
nKSP 0
The pitch is higher than or equal to that of sample pitch
1
The pitch is lower than that of sample pitch
oVVA Attenuation = -12*bit1 -6*bit0 (dB)
pFN
F_out = F_wave * (FN + FM + 2¹⁰) * 2^{-8*KSP+OCT-10}
where F_out = final output frequency
F_wave = frequency of sample wave
Register 3
Default Value : 00000000h
Bit Type
Function
31:28 R/W Key Scale Ratio (KSR)
27:24 R/W PAN -Low (Stereo control)
23
R/W PAN MSB
22:16 R/W Volume (VOL)
15:12 R/W Attack Rate (AR)
11:8 R/W Overshoot Rate (OR)
65