you could separate the minijack stereo out and feed it through the two A4 1/4 jack inputs, but you won’t be able to sequence the MFB from the A4, the A4 does not currently sequence via midi, only cv !
you’d have to clock the mfb by a4 midi to get sync happening, if it takes sync this way
save up, you won’t regret it if you have patience to learn the depths of the A4