I have a Sony TC-730 tape recorder (tape deck + amplifier + internal speakers and external speaker connections) that has a switch for sound-on-sound or sound-with-sound. Unfortunately, it no longer works but it was quite the machine.

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Jim Fogle - 2024 BiaB (1111) RB (5) Ultra+ PAK
DAWs: Cakewalk by BandLab (CbB) - Standalone: Zoom MRS-8
Laptop: i3 Win 10, 8GB ram 500GB HDD
Desktop: i7 Win 11, 12GB ram 256GB SSD, 4 TB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home