Multicoder 500 is an expanded revision of Multicoder by t8r for Organelle. It keeps the original four-note polyphonic phase-vocoder instrument and adds 500 fixed recording slots with persistent recall. Select any slot with the encoder, use AUX + the leftmost wooden key to record or overwrite it, and AUX + the rightmost key to stop and save. AUX + the second key from the left provides a two-step erase command. ORIGINAL / Slot 0 is permanently protected. AUX alone never creates ghost samples, and command-key notes are suppressed while AUX is held to avoid the short vocoder burst during recording commands. Hardware-tested on Organelle S2. Original Multicoder: t8r. Revision concept and hardware testing: Pascal Glenn.