RMC OPT-01 subsonic filter module for Roland GR-55

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The RMC OPT-01 is a 6-channel subsonic filter module that installs in the Roland GR-55 to eliminate the subsonic over-sensitivity in that unit.

Please note this unit is specifically designed for use with PIEZO pickup systems.  The GK pickups are not piezo and suffer from a different type of interference.   

All international orders are shipped FedEx International Priority and delivery takes just a few days.

Please note, International Order shipping fees do not include import duties or taxes.  
Please speak to local resources to determine import tax rates and information.

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  • 5
    RMC Opt-01

    Posted by michael Waugh on 31st Oct 2019

    Great product . Helps a lot , when following instructions.
    Thanks for the phone support !

  • 5
    RMC OPT-1 Subsonic Filter Module for GR55

    Posted by Phil Campbell on 16th Oct 2018

    After weeks of searching for this product - was finally able to locate it at Sound Island Music. They responded to my phone call with prompt service and, since i ordered two of the modules - threw in free shipping - Thank You Michael!

    The RMC filter works as advertised - eliminating the low frequency rumble that causes ghost notes and glitches in tracking on the GR55. I am now making use of patches and sounds that were UNUSABLE prior to the RMC beng installed. If you are having difficulty playing sounds on your GR55 - make the investment and get this thing - it is the TRUTH!