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Early versions of Jam Origin were limited to detection, making them suitable for lead lines but cumbersome for rhythm playing. Starting with version 9, a polyphonic decoder was introduced, capable of recognizing up to six simultaneous notes (the typical limit of a six‑string guitar). Version 13 refines this decoder with a dynamic time‑warping (DTW) front‑end that aligns note onsets across strings, reducing “ghost notes” and improving chord‑recognition accuracy to over 95 % in benchmark tests. jam origin midi guitar keygen 13