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.




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  • 5
    RMC OPT-01

    Posted by Dana Rasch on 28th Sep 2020

    Does what it's supposed to do.
    As a professional jazz guitarist, I found the GR 55 to have such significant tracking challenges that I couldn't consider it much more than an $800.00 toy. The OPT-01 actually makes this Synth usable., and the tracking is reliable enough to gig, or even record with. Roland should have worked out a deal to have this pre-installed instead of giving unwary purchasers the idea that their pick-ups might be installed incorrectly, or that they needed to work with the sensitivity , or worse....that their technique could be the problem.
    all of which occurred when talking with their support. They obviously don't mind wasting people's time in order to profit off of people.
    The installation was not too difficult and they provide a page and some YT links on how to do it, as well as some tweaking advise.
    I was also very impressed at how quickly this item got to me. Thanks for a great product !

  • 5
    Subsonic filter

    Posted by Stephen Russell on 14th May 2020

    This is not a magic bullet, but it definitely improves tracking. I'm surprised roland don't mention it as a retro fit. Very pleased, this ain't t cheap, but where tracking is paramount..........yes!!

  • 5

    Posted by The Judge on 28th Mar 2020

    I've had a Roland Guitar synth for some years and decided to spend some money on the GR55. It is vastly improved over the old models but there are some sounds which just will not play. I found the OPT-1 on line and bought it, had it shipped from the USA (Sweetwater Music..thanks guys). The Price is £210 $, plus $50 for postage. (Fedex and in the UK inside four days.) Then got stung for another £44-50 by the UK customs. It's expensive when you start adding everything up but the bottom line is that it works. It's not perfect but it makes playing the GR55 "awkward sounds" a hell of a lot better. Tracking is greatly improved on the pianos and the saxophones and it's easy to install but you need to be careful removing the ribbon wire connectors and make sure you don't carry a static charge when you do it. Don't hack at it with a knife, tease it loose with your fingers it only takes a little while. Just be careful you put insulating tape over the circuit board to avoid shorts against the metal casing of the GR55 as the provided velcro pad is too small to provide 100% protection. I use an Ibanez guitar retro fitted with the GK 3 pickup. The first rule is. SET YOUR OWN GUITAR UP PROPERLY AND IT WILL PAY DIVIDENDS. Also you need to experiment with the string sensitivity in the GR55. None of my settings are over 27 and many are lower than that. Was it worth it? Yes. Now to midi it to the older synth.......

  • 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!