Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 568)

Audio Commands
Gain Control +VGR
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WM_DEV_OAT_UGD_049 - 001 VOLUME 4 August 23, 2007
21.6 Gain Control +VGR
21.6.1 Description
This command is used by the application to set the speaker gain
21.6.2 Syntax
Action command
AT+VGR=<Rgain>
OK
Read command
AT+VGR?
+VGR: <Rgain>
OK
Test command
AT+VGR=?
+VGR: (list of supported <Rgain>s)
OK
21.6.3 Parameters and Defined Values
<Rgain>:
reception gain
range 0-12 (default value: 6)
21.6.4 Parameter Storage
All parameters are stored in EEPROM without using the AT&W command. The
default values can be restored using AT&F or AT+VIP=1.