MPC Sequencer Hiccups
Sometimes you may hear a small glitch when a looped sequence goes back to the beginning. This is almost always traced back to a problem with the amount of data in that sequence. Each sequence can only hold the equivalent of 50,000 notes. Things like pitch bend messages or aftertouch message add up very quickly in a sequence and are the likely culprits. If possible, thin out or remove some of this data. If you do not need aftertouch messages at all, just set the midi filter options to not record this data so it will not record this data at all.
Note: this is not related to another similar problem with hearing a dropout associated with looping and program changes being embedded in the sequence