Hello, Chuck users! I work on chuck program for live performance. Main goal of program is play and delete sequences, made from pre-made text file. All sequences are separate shreds which running and stoping by SequenceController class; each sequence is instance of Sequence class. So my problem is: For example I have three sequences running. If I delete sequences in inverse order, all works fine; other way one of all sequences can not be deleted and lookup() function shows all sequences name as name of undeletable sequence. Here is a link on PasteBin - http://pastebin.com/5Kk8xVKV I guess problem is in removeSeq function on line 82. I've got number for sequence from midi controller and it is an 0 indexed integer. Thanks for yours assistance. Phlox.s