I have recently purchased and attempted various connections with:
1) Vention 2 RCA Audio to USB C Cable - from Yamaha deck through RCA Out jacks to MacBook Air, running Sonoma 14.5 on Apple M2 chip
2) DCHAV RCA Audio to USB A - from Yamaha deck through RCA Out jacks to: a) iMac late 2015 running Monterey 12.7.5, or b) MacBook Pro (mid 2012) running Catalina 10.15.7
3) MOSWAG Audio Jack (headphone) to USB A - from Yamaha deck through headphone jack to: a) iMac late 2015 running Monterey 12.7.5, or b) MacBook Pro (mid 2012) running Catalina 10.15.7
When recording on MacBook Air
there is no movement on the VU meter (and in fact I cannot monitor the recording process). Both the input and output register as UC02. If I change the input to MacBook Air Microphone and the output to MacBook Air Speakers I can successfully record clapping, and I can see the VU meter move as I clap.
When recording to the iMac:
using RCA to USB - Garageband does not recognize any input either using the USB A receptacle on the back of the iMac or a USB bus.
using the headphone jack to USB A - Garageband recognizes input as (USB Audio). When recording the VU beside the track being recorded barely registers - never goes above a small green segment. The "Record Level" is set at maximum in both the "Record Settings" pane and in the slider beside the track being recorded. The VU meter at the top right ("Master Volume") also barely registers. But still no discernible actual sound on the track.
When recording to MacBook Pro:
using RCA to USB - Garageband does not recognize any input using the USB A receptacle on the MacBook Pro (I assume, therefore, that the DCHAV RCA Audio to USB A cable is basically useless.
using using the headphone jack to USB A - Garageband recognizes input as (USB Audio). When recording the VU beside the track being recorded barely registers - never goes above a small green segment. The "Record Level" is set at maximum in both the "Record Settings" pane and in the slider beside the track being recorded. The VU meter at the top right ("Master Volume") also barely registers. But still no discernible actual sound on the track.
(Well, that is actually not true. When the cassette tape is playing and Garageband is recording I can hear the faintest of sounds via the headphones plugged into the MacBook Pro. I hear the same level of sound on the headphones when playing back the track. Even choosing maximum output volume gives only a only the lowest of sounds. Not a sound file I could save and share with friends.)
I should mention that these are old audio book tapes, so only speech, no music.
(For MacBook Air, iMac, and MacBook Pro, Garageband has permission to access the microphone.)
I am stumped.