HP-557R: Using a Microphone
Use the following procedure to connect & adjust the Volume of a Microphone:
1. Connect a Microphone to the Mic Jack (Located under far right of HP-557R).
2. Rotate the [Mic Echo] knob in front of the Mic Input jack to adjust the echo level.
3. Rotate the [Mic Volume] knob in front of the [Mic Echo] knob to adjust the volume level.
Refer to Owners Manual, pg. 15 for more information.