Hey, at 48kHz 16bit Stereo uncompressed, 64GB memory isn't even enough for a week of continuous recording. Of course if you just record MIDI (after all, the instrument should be a near perfect expander), we will more likely be talking about years…
Yeah, but they never claim, to my knowledge, to
record to pure audio. That'd be quite a silly thing to do (as well as a difficult one for opening something back up and re-editing things). They claim to
use only recorded audio tracks as the sound sources. Which I read as "we use a sample library", not "we record your music straight to uncompressed PCM".
For a handful of instruments, that fits on a handful of gigs at very high quality. For more middle-of-the-road quality, you could fit quite a few more than a handful of instruments in a handful of gigs. Yes, we're in the age of terabytes of data for sound libraries on recorded-instrument audio - but that's for 96kHz samples of at least 32-bit frames, often at several channels (not just stereo), and probably multiple of the same samples at different sample rates. Also, quite a lot depends on how thorough a library you're trying to provide. EastWest's terabyte-sized libraries have a fairly insane level of recorded starts and stops, sustains, vibrato, not vibrato, trills, glissandos, etc etc. Multiplied by those ridiculous sample rates and variations of recordings. I say "insane", and "ridiculous", but of course they're not at all for East West's intended users. I would not, however, expect that level of extreme dedication to fidelity to this sort of app running on a phone. For all I know, it may not even be stereo samples (you can add "stereo" back in, in the arrangement, which of course will not at all be as good, but they could still be doing things that way), and you could certainly get by on 44.1kHz samples at 16 bits, I'd imagine (CD quality). A handful of gigabytes seems plenty, to me, considering that a ~700mb CD can hold an hour's worth of instrument samples. (700mb wouldn't be the best in the world, and at that level would render the "brag" that it's "all recordings based" to be kind of underwhelming, but it'd still be a true statement - and we're talking about several gigs here, so we can do
much better than that without resorting to streaming.)
None of which means they
don't stream the audio... but I don't feel there's nearly enough evidence from this scant claim to support that as a foregone conclusion from what's been discussed so far.