Superbooth 2026: GRP Synthesizer is a new flagship semi-modular analog Synthesizer with analog effects, and more – new details.
Last year, shortly after Superbooth 2025, the Italian firm GRP Synthesizer published plans for building the A10. These plans and drawings have now been put into reality.
Ahead of Superbooth 2026, GRP Synthesizer published the first photos of the A10 flagship semi-modular Synthesizer.
GRP Synthesizer A10
The A10 is a true monster synth hand-built in Italy. It is semi-modular and offers a wealth of features, all of which are tweakable with knobs.
GRP Synthesizer already announced most of the A10’s features last year. Now they’ve been confirmed again.
As a reminder, it has a semi-modular analog engine with four VCOs with hard sync, cross mod, gate reset, super saws, two FM lin/exp, PW, PWM, and ring mod. There is an 8-channel stereo mixer with various filter routing options.
Then, you have not one but four different filter types: transistor ladder, state variable, 18dB lowpass diode, and lowpass vactrol, each with manual and CV controllable cutoff and resonance.
Analog FXs and Modulation
A highlight of the A10 is its super-flexible routable analog effects section, consisting of a dual-voltage-controlled wavefolder (pre/post filter), a feature-rich 1-sec BB stereo delay, dual triple resonators, a VC dual phaser, and a spring stereo reverb with two independent tanks.
Of course, you also have modulation in the form of two voltage-controlled DAHDSR envelope generators for the VCF section, an amp ADSR Envelope (2/4), two 5-waveform VCLFOs, a sample & hold, and two more assignable modulation sources like the VCOs.
That might not sound like much for such a huge synth at first glance. However, each section offers a multitude of options, allowing you to achieve a great deal.
The GRP Synthesizer A10 also features a multimode arpeggiator that can be assigned to the upper and lower sections when the instrument is set to split mode.
A large part of the user interface is occupied by the sequencer on the left, which can be operated hands-on. It offers three rows of eight steps, which can be configured in 8×3, 16+8, or 24 configurations, giving you a single sequence of 24 steps.
Among other things, each Row is independently configurable for step sorting order (1.3, 2.1, 1.3.5, 1.1.21, 1.2.3.2) and step repeat (X2, *2, Ratchet *3, ratchet *4, glide On/Off, legato On/Off). This is a super mighty hands-on sequencer.
On the connection side, the A10 has everything you need: CV connectivity over most parameters, inputs and outputs for each sound-relevant section, pre and post master outputs, external input, balanced XLR, clock I/O, and a 5-pin MIDI/USB interface.
Superbooth 2026
According to the GRP Synthesizer, the pre-order list will be closed at Superbooth 2026 next week. On SB, they will have a non-sounding pre-prototype to check out.
You can still pre-order it for 10,000 € + VAT, with expected availability by the end of 2026. However, if you order now, delivery will likely not be until Spring 2027 because they have over 40 units on pre-order.
A deposit of 1,000€ per unit is required, with a second pre-payment of 2,000€ due 3 months after the deposit. After they close the list, they will start offering the A10 via direct sales or through their dealers. The retail price will then be 12,000 € + VAT.
I’m looking forward to checking out this huge synth next week. It’s a real flagship synth.
More information here: GRP Synthesizer
Article from May 19, 2025
The Italian developer Paolo Groppioni, aka GRP Synthesizer, has produced high-quality handmade synthesizers for many years. With the GRP A1, they released their first mono synth à la Doepfer Dark Energy last year, which is significantly more affordable than the previous products.
This digression was probably only brief. GRP Synthesizer is currently teasing the A10, a new flagship semi-modular Synthesizer.
GRP Synthesizer A10
The A10 Synthesizer is still fully developed and appears only in the design phase. However, we can already see that the upcoming GRP Synthesizer A10 will surpass the current giant A8 synth.
The synth, measuring 1200 mm x 560 mm, will consist of three sections: a semi-modular synth, the R24 sequencer, and several effects.
A10 will feature four classic VCOs with PWM, hard sync, cross-mod, and linear/exponential FM. Additionally, you can find a sub-oscillator, a noise generator, a ring modulator, and an external input. All this goes into a multi-channel stereo mixer. The filter section is also packed with features.
There are two filters, each offering a choice of two distinct circuits: transistor ladder or Vactrol in filter 1, and diode or SVF in filter 2. The transistor ladders also offer five slope variations, and the SVF has five modes.
The filters can be operated in series and parallel, are overdriven at the input, and can be modulated by numerous sources, including resonance. A wavefolder can be placed before or after the filters. Nice, this brings harmonic-rich, West Coast sounds to the GRP synthesizers
Then, it will also have an impressive set of modulation, including three multi-wave LFOs, two DAHDSR envelopes, a sample & hold generator, and more. You can play synth engine in mono, dual, and split modes.
Effects & Sequencer
The second section of the GRP Synthesizer A10 contains an analog effect section. In addition to the analog wave folder, it houses a stereo BBD delay with independent sync and modulation for both channels, a dual triple resonator with LFO, a dual voltage-controllable phaser with 6 or 12 stages, and a stereo spring reverb.
This already sounds tasty and probably sounds pretty epic. Further, it has an integrated sequencer based on the standalone R24 hardware unit with three rows of eight steps. This expanded version can combine the rows and offers ratcheting, step repeat, clock division, and more. A MIDI-controllable arpeggiator is also onboard and can be used parallel to the sequencer.
The GRP A10 Synthesizer features a patch matrix with numerous inputs and outputs, making it a semi-modular instrument. Two CVs can also be assigned using switch knobs. On the connection side, we can see balanced XLR audio outputs, MIDI DIN, and USB.
First Impression
This is the first information available so far about the new GRP Synthesizer. It looks like a true flagship semi-modular synth. I’m excited to hear how it will sound, especially in combination with the analog effects.
GRP Synthesizer A10 availability and price are TBA.
More information here: GRP Synthesizer
Loved the A6, I’ll be picking up one of these for sure.
Price tag will be around 10k tho.