Grp has announced that production of the 2013 Series of the Grp A4 Synthesizer will start June 1st and that ordering will remain open until that date. Here’s what Grp has to say about the A4 Synthesizer: The A4 has been derived from an audio section of the Grp A8 (of which it takes over the… Read More The Grp Synthesizer A4 Synthesizer 2013 Series