Check your power adapter. This unit REQUIRES a 9 volt AC adapter, NOT a DC one... It MAY appear to operate on DC BUT it can't generate the +/- voltages internally for sound generation with a DC adapter. This is a common problem as people try to run these on a DC adapter.
Here is a link:
http://cgi.ebay.com/AC-POWER-ADAPTER-Alesis-HR16-SR16-D4-DM5-/380178938839
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