Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 569)

Audio Commands
Gain Control +VGR
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WM_DEV_OAT_UGD_049 - 001 VOLUME 4 August 23, 2007
21.6.5 Examples
Command Responses
AT+VGR=?
Note: Test command
+VGR: (0-12)
OK
Note: Possible values
AT+VGR=12 OK
AT+VGR?
Note: Get current reception gain value
+VGR: 12
OK
Note: Receive gain
21.6.6 Notes
The value of +VGR depends of the current speaker. AT+VGR= returns "+CME
ERROR: 3" if the current speaker value is +SPEAKER: 9 ( digital speaker).
The following table gives the gain corresponding to values:
For the gain HFR For the receive gain EAR
0 -34 dB -40 dB
1 -30 dB -36 dB
2 -26 dB -32 dB
3 -22 dB -28 dB
4 -18 dB -24 dB
5 -14 dB -20 dB
6 -10 dB -16 dB
7 -6 dB -12 dB
8 -2 dB -8 dB
9 2 dB -4 dB
10 6 dB 0 dB
11 10 dB 4 dB