Grumpy Old Geeks Products MixPre-3 Product MixPre-3 2 mentions in 1 episode Jason describes the MixPre-3 as an audio device with a built-in recorder that records to an SD card. Mentions 585: Certified Human Jan 22, 2023 55:03 The MixPre 3 is fantastic because it has a built-in recorder in it 55:21 I just press record. It records to an SD card.