This feature was added in an earlier version with Replay Radio 9 and I tested today. Was able to schedule a recording with a start time to record from an external source like from a radio unit's headphone output jack connection to a USB sound card's mic input jack. Scheduler was set to capture from record audio (device) and Device was set USB Sound Device. I used a 1/8 inch cable to connect the radio's output to the mic input of the USB sound card. I have JAWS set to use my laptop's internal sound card while in Windows OS I have the default sound card set to the USB sound card. This allows me to use my screen reader without being interrupted. Possibly if I used amplification I would have heard the sound output from the radio but with no amplification I could not monitor the sound from the radio during recording with Replay Radio 9. Works great for me.