Set your song's key and tempo once. Every loop follows: the Beat Slots engine plays its notes again, right here — it does not stretch audio. Drums keep their pitch.
Pick your key and tempo at the top. Every loop in the bank follows them, even while it plays. Drums and hats keep their pitch.
The WAV is built on the spot, in your key and at your tempo, and named for your DAW: Arp_Mooger_BS_140_Fmin_Trap.wav.
Same sound, new groove: Re-spin draws another pattern from the same family, like the G button in Beat Slots. Thousands of loops from the same sounds.