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Byte 1: Bits 0 - 6 of the mask (in the low 7 bits of the byte)
Byte 2: Bit 7 of the mask (positioned in the LSB of the byte)
Byte 3: Bits 8 - 9 of the mask (in the low 2 bits of the byte)
Byte 4: 0
A "1" in a bit position will apply the gain in byte 5 to the associated channel, while a "0" in a bit position will
not apply the gain to the associated channel.
Byte 5: Input gain value, 0 - 78 (0-4E hex), which represents +15dB to -63dB, 79 (4F hex) for off, 80 (50 hex)
to increment the current gain by 1dB, 81 (51 hex) to decrement the current gain by 1dB, 82 (52 hex)
to mute the input, and 83 (53 hex) to unmute it to its pre-mute gain value.
Get Input Activity Status - Gets the current status (i.e. active or inactive) of the 8 automatic inputs. Active means
that the attenuation applied to the input by the automix algorithm is less than or equal to 6dB.
Host sends command - 20 (14 hex)
Host receives 1 byte:
Byte 1: Input activity for channel 1 - 8, packed in one byte such that the LSB of the byte corresponds to input
1 and the MSB corresponds to input 8.
Output Related Commands
Get Output Gain - Gets the output gain associated with any one output or all 4 outputs. This gain value is the same
one you can manipulate from the Output Gain tab on the AM8/4 control panel.
Host sends command - 61 (3D hex)
Host sends 1 byte: input number to return, 0 - 3 returns the single gain value from outputs 1 - 3, while 4
returns 4 bytes representing the output gain of all outputs, starting with output 1.
Host receives 1 or 4 bytes: input gain(s), 0 - 79, where 0-78 represents +10dB to -68dB, and 79 is off. If
the output gain value is greater than 127, this means the output is muted. The unmuted gain may be derived
by subtracting 128 from the returned value.
Set Output Gain - Sets the output gain of 1 or more input channels.
Host sends command - 60 (3C hex)
Host sends 2 bytes:
Byte 1: A 4 bit mask, where each bit position represents one of the 4 outputs. For example, the lowest bit of
the mask represents input 1, the next lowest bit input 2, and so on. The 4 bit mask is as follows:
Byte 1: Bits 0 - 3 of the mask (in the low 4 bits of the byte)
A "1" in a bit position will apply the gain in byte 2 to the associated output, while a "0" in a bit position will not
apply the gain to the associated output.
Byte 2: Output gain value, 0 - 78 (0-4E hex), which represents +10dB to -68dB, 79 (4F hex) for off, 80 (50
hex) to increment the current gain by 1dB, 81 (51 hex) to decrement the current gain by 1dB, 82 (52
hex) to mute the input, and 83 (53 hex) to unmute it to its pre-mute gain value.
Rio Rancho, NM – USA
8 Channel Automatic Matrix Mixer
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