15 years after the legendary GRP A8, which was built in 2009/2010 in a small edition of 23 units, the Italian company is once again announcing a “monster” studio synthesizer: The GRP A10. The instrument, measuring 120 x 56 cm (width / height), will be manufactured in 2026. It includes two independent synth channels, an R24 step sequencer, an arpeggiator, several analog effects and more.
With its 4 VCOs + 1 sub-oscillator, the A10 doesn’t quite reach the oscillator power of the A8 (which had 6 VCOs and 6 sub-oscillators), but scores with a general more flexible oscillator-compartment, an incredible filter section (2×2 VCFs incl. VC resonance, 2x triple resonators), BBD Delay / Phaser / Spring Reverb, an 8-bus audio mixer, dual wavefolder and other extras.
The already very respectable modulation sources of the GRP A8 (and subsequently GRP A4) have been extended even further (now 21-fold instead of 11-fold routing switches), the two filter envelopes are voltage controllable (!), the two VCA sections accommodate 4 (unfiltered) sine waveforms (à la Yamaha CS synthesizer) and the significantly larger range of outputs/inputs (audio as well as CV) will surely make the studio musician’s heart pulsate …
x
The tonal and structural possibilities of the GRP A10 at a glance …
In addition to the generous VCO-VCF-VCA architecture of the GRP A10, the performance options include an extended R24 step sequencer and a separate arpeggiator, which is a significant enhancements compared to the GRP A8.
Those VC LFOs 1/2 are familiar from the GRP A8 / GRP A4, but feature extended possibilities in combination with the step sequencer. Eventually, the “global” LFO 3 allows you to set independent mod-intensities for the LOWER and UPPER synth section …
The range of inputs/outputs has also grown significantly (as already indicated). Above all, the extensive audio outputs (which were present on the GRP A8, but have been reduced to a simple stereo out on the GRP A4) are back again: 4x stereo audio out (pre master LOWER + UPPER, main out balanced + unbalanced), not to forget the audio input (external signal processing).
The GRP A10 also has MIDI / USB, of course, to be found on the rear. Definitely new are those inputs and outputs for the analog effects, as well as 2 “assignable” CV inputs …
Some of the new “specialties” in detail: The analog effects are certainly the absolute novelty, never seen on a GRP synthesizer before. BBD Stereo Delay (with various clock divider options for each side, plus ping-pong), for example …
… or the Spring Stereo Reverb (we’d call it Stereo Spring Reverb :o). Sample & Hold is, of course, may be old hat, but it is essential – especially in combination with the LFOs and the sequencer and delay-effect (keyword clock-sync).
Dual phaser and the two triple resonator filter(s) à la Korg PS series – another novelty – round off the GRP A10 sound architecture …
… just like the massive mixer. Up to 8 audio sources can be assigned individually and continuously (!) to the main filter sections, whereby the two VC triple resonator filters are then activated / bypassed separately for each synth section.
x
So far for now. The price of the GRP A10 is €10,000 + VAT for pre-orders placed by the end of 2025. The regular price thereafter will be €12,000 + VAT.
x
Picture: The GRP A10 will be approximately the same size as the GRP A8 (2009).
Picture: The GRP synthesizer family (except for GRP A1).
x
GRP A10 Synthesizer
Dual Synthesizer with sequencer, arpeggiator,
analog effects and MIDI / CV / Gate
Pre-Order 2025
Delivery by end of 2026
Price:
Pre-Order (until end of 2025): 10.000 Euros + VAT.
Regular Price (as of 2026): 12.000 Euros + VAT.
Email: info@grpsynthesizer.it
Download:
Website Manufacturer:
Related Reviews:
Yes, really another monster synth. Paolo already mentioned some time ago that something BIG is coming, it really is equipped like a big battleship.
In 2013, after receiving the A4, I asked him (a very nice person, by the way, who takes the time to answer all your questions) whether he was planning to build any additional GRP effects in the future and at some point a GRP master keyboard (with several features). I’m pleased to see that half of my wishes have already been fulfilled in the A10 …
… and I also hope that the A10 deserves a complete German manual, perhaps from you, like the A8? Unfortunately, the A4 doesn’t have one …
I am on the fence on buying this. It’s so hard to decide! The discount preorder deadline has been extended to the end of December…
I ordered the GRP A10 and decided that it’ll be the last new synthesizer I will allow myself to buy (… one or two vintage synthesizers may be added). True, I’m a loyal fan of the GRP synth architecture since 15+ years. The A8 is a milestone (just listen to its unrivalled rich, both subtle and massive sound, and to its fabulous dynamics), and little brother A4 is no less impressive (while missing the true stereo / dual synth environment). The A10 is likely to surpass both of them. While its sound will surely differ slightly from the A8, its many rhythm/pattern-based features (R24 sequencer and arpeggiator – two independent clocks -, S/H, LFOs, BBD delay, etc.) represent a totally new dimension. Let alone the extended filter options and the triple resonators. For me, this is likely to be a once-in-a-lifetime instrument, offering creative potential for many years (if not decades).
Same, I consider it to be a once-in-lifetime instrument as well. I just got a newsletter saying that they are extending the preorder period until Superbooth in Berlin in May 2026 where a prototype will be presented. The newsletter also had electromechanical diagrams of the A10 panel so I am happy to see progress. I am going to take it slow and follow these newsletter updates closely. I got a feeling I am going to end up preordering it by then.
I preordered this beautiful instrument. My only wish is for dimmable LEDs – because there are so many, and they were so bright on my A4.
… a very good point … Yes, the (blue) LEDs of the GRP A4 are way too bright, you need sunglasses when operating the synthesizer … I’ll forward your suggestion to Paolo … maybe there’s a solution for this … Cheers – Theo