Not to beat a dead horse but I'm really flabbergasted on this one. There is simply no such thing as a simple audio breakout cable that includes digital input for input to iOS. There's an analog input adapter for iPhone, but no digital. What century is this? Due to picking a firewire interface over USB a million years ago I apparently have to keep my 8 year old laptop running forever. Fuck USB's infection of audio and lightning connectors and all this bullshit. Cheapest digital input interface for iPhone is like $250-300 (according to Sweetwater), which also gets me yet another crappy consumer mic pre and/or an instrument line that I don't need. There should be a standard 6 rca plug breakout cable for iPhone that has the standard stereo analog in/outs and s/pdif in/out and it should cost something like $30. The interface should be kept separate from the equipment, which should talk to computers through those inputs, not through fucking USB or Firewire. The whole reason I'm in this mess to begin with is that MacBooks only ever had digital out and not in, which never stopped pissing me off.
One shouldn't have to keep buying mics and mic pres just to keep up with computer evolution. Audio and computers should be separate things, connected by s/pdif, partly because whatever converters you end up with the outboard one I'm sure is almost always going to be better than onboard consumer laptops and phones (unless this has changed? I stopped paying attention for about 10 years)
I'm also frustrated another mic I have, the AT822 (not great but perfectly serviceable for casual scratch recording use and excels at portability) can't work well with anything modern. Worked great with the mini-disc that I bought it for, but since mini-disc became obsolete in about 5 minutes (and I always hated that it had no lossless option, the compression always bugged me), now I'm stuck with an unbalanced output battery powered mic that doesn't put out enough signal to not have to turn up the pre to unusably noisy levels and yet also can't take phantom power. It can plug into an old griffin iMic that is super noisy, or I have an old tape deck that takes 1/4 trs mic input (one of the output cable options with the mic), but that defeats the portability advantage. Not sure why those battery powered mics that were briefly made for Walkman and portable DATS and mini-disc and video cameras went away with those items, just because the tech they plugged into changed doesn't mean what they were used for went away.
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