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Press the [Setup] key to edit the selected tone and go 
to the following screen:
Use the [Tab] key to select the tone type, frequency 
or level.  Use the keypad to change the values.
The frequency range is 200 to 1000 Hz for ID Tones,  
200 to 19999 Hz for Precision Tones, and 20 KHz to 
1200 KHz for High Frequency Tones.
The output range for Precision Tones is -20.0 to 
+1.0 dBm.  The output level for High Frequency 
Tone is fixed at 0 dBm.  The ID Tone output is set at 
maximum level.
Press the [Enter] key to accept the changes and 
return to the Tone Menu screen.
Press the [Return] key to return without making 
changes.
Press the [Up] and [Down] keys to adjust the 
volume.  The output impendance for the Precision 
Tone (600 
Ω) and the High Precision Tone (135 Ω) 
will be visible in the lower left side of the screen.  
Use [Enter] to stop sending.
Note:  The volume control does not affect the level 
of the tone sent on the pair.