Need advice on how to use Advance Digital ADS Instant Music RDX-150

Assuming you have recording software on your machine already: (GoldWave, Audacity...)

Plug the USB cable into the back of the ADS and into the computer

Connect a line-level analog audio source (tape player, turntable, radio, amplifier, etc.) to the ADS using the appropriate cable to fit the source on the one end and has RCA connectors on the other - plug into the Audio In jacks (Red and White)

Ensure that the recording source on the computer is set to the appropriate USB port

Select record in the software and start the analog source playing

Note: If you are using a microphone, make sure it is amplified to line-level before using as a source.