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To clear the MIDI memory if pressing the 4 buttons doesn’t work, you need to remove the flat round battery for about 10 seconds and then put it back. First unplug your Pulsar from its PSU and make sure it’s powered off.
You access the battery by unscrewing the 8 screws on the back and gently lifting up the back plate. Locate the battery and take it out. Wait 10 seconds before putting it back. Return the back plate and the 8 screws and you’re all set.