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The GR55 features two independent synthesizer sound engines, each of which can access the same 910 voices, including pianos, organs, orchestral sounds, various synths and percussion. Bassists can also use the GR55, by playing an instrument with a GK bass pickup fitted to it. The GR55 is available with or without a GK pickup and mounting parts, which means that most guitars can be adapted to work with the system. Roland also claim that the GR55 has significantly faster and more accurate pitch-tracking than their previous GR synths. Roland's GR55 Guitar Synthesizer, announced at the January 2011 Winter NAMM show in California, is the first product to put both their PCM Synthesis and COSM Modelling technologies in a single floor unit. Roland use this same hex pickup to drive their COSM (Composite Object Sound Modelling) guitar- and amp-modelling VG-series processors, so it seemed inevitable that these two different guitar technologies would eventually be combined. You had to use Roland guitars with the GR500 and some of the later models, but the current system allows you to fix a Roland GK hex pickup to your own guitar. Today, their guitar synths are all digital, but what they have in common with their ancestor is that they require a pickup system that provides a separate signal for each string on the guitar. Roland have been at the forefront of guitar synthesis since 1977, when they launched the all-analogue GR500. Could this be the best guitar synth ever? Roland have put elements of their two very different approaches to guitar synthesis in a single box.