'''Noise Period Register ''' {|{{Prettytable|width: 700px; font-size: 2em;}}|-|'''R6 '''||'''B7 '''||'''B6 '''||'''B5 '''||'''B4 '''||'''B3 '''||'''B2 '''||'''B1 '''||'''B0 '''|-|colspan=3|NOT USED ||colspan=5|5-bit Noise Period (NP) to Noise Generator |}
=== Mixer Control Enable (Register R7) ===
These functions are illustrated in the following:
'''Mixer Control-I/O-Enable Register R7'''
Mixer Control{|{{Prettytable|width: 700px; font-I/Osize: 2em;}}|-Enable Register R7 |'''B7 '''||'''B6 '''||'''B5 '''||'''B4 '''||'''B3 '''||'''B2 '''||'''B1 '''||'''B0 ''' |-|colspan=2|/Input Enable ||colspan=3|/Noise Enable ||colspan=3|/Tone Enable |-|B ||A ||C ||B ||A ||C ||B ||A|}
=== Amplitude Control (Registers R10,R11,R12) ===
The amplitudes of the signals generated by each of the three D/A Converters (one each for Channels A,B and C) is determined by the contents of the lower 5-bits (B4--B0) of registers R10,R11 and R12 as illustrated in the following:
{|{{Prettytable|width: 700px; font-size: 2em;}}
|'''Amplitude Control Register'''||'''Channel'''
|-
|R10||A
|-
|R11||B
|-
|R12||C
|}
Amplitude Control Register Channel
R10 A
R11 B
R12 C
B7 B6 B5 B4 B3 B2 B1 B0
NOT USED M L3 L2 L1 L0
amplitude "mode" 4-bit "fixed" amplitude level
{|{{Prettytable|width: 700px; font-size: 2em;}}
|'''B7'''||'''B6'''||'''B5'''||'''B4'''||'''B3'''||'''B2'''||'''B1'''||'''B0'''
|-
|colspan=3|NOT USED||M||L3||L2||L1||L0
|-
|cospan=3|||amplitude "mode"||cospan=4|4-bit "fixed" amplitude level
|}
=== Envelope Generator Control (Registers R13,R14 and R15) ===