Yeah, it's just a really uncommon use, but then you see people using things like the Volca Kick as subbass synths...similar idea. Sort of goes back to an example I should've realized then...the "magic moment" in Stockhausen's "Kontakte" when a note starts descending, goes into the subsonic rates, then becomes a rapid pulse...and finally, very slow single pulses with their pitch being determined by a resonant filter. Sort of like extratone stuff, but in reverse.