Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 571)

Audio Commands
Gain Control +VGT
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WM_DEV_OAT_UGD_049 - 001 VOLUME 4 August 23, 2007
21.7.5 Examples
Command Responses
AT+VGT?
Note: Get current transmission gain value
+VGT: 1
OK
Note: Default transmit gain
AT+VGT=2 OK
AT+VGT=?
Note: Test command
+VGT: (0-2)
OK
Note: Possible values
21.7.6 Notes
The value of +VGT does not depend on the current speaker.
AT+VGT=<Rgain> return "+CME ERROR: 3" if the current speaker value is
+SPEAKER: 9 ( digital speaker).
The following table gives the transmit gain values.
<Tgain> For the transmit gain
0 7 dB
1 20 dB
2 35 dB