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This page displays the information available for the various-GRP Synthesizer A4 semi-modular (Sphere item # 30904).
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Detailed description, from the owner or the reseller, prices and supported shipment are displayed. Question and answers as well as reserving or bidding for the item are also available on dedicated pages by using the links on the menu.


Detail    top
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 Make various
 Model GRP Synthesizer A4 semi-modular
 Description Here is a GRP Synthesizer A4 in very good condition which was purchased at the Vemia auction in 2022. Everything works fine. In the process of testing, I realised how much I will miss this synth. However, I do not currently have a dedicated studio so space is a problem for me.

I'm guessing that anyone looking to buy this synth will already know most of the details. The construction quality is truly fantastic, like an Italian sports car. The knobs are a joy to turn. The sound is extremely high quality. I would say a 60's/70's style sound, where it can do Radiophonic Workshop or more conventional tones. Jean-Michel Jarre is very fond of this model and has been using one with his live sets for the past few years. It has a large number of filter choices and routings. It sounds great alone, or connect a pedal or two and you can travel to other galaxies very easily.

I had wanted this synth for years, and it was too tempting to resist, but I live in a smaller house now and I really have to let the A4 go. Please note the fairly small scratch on the wooden casing. There are a couple of other smaller marks too. I genuinely cannot remember if they were there when I bought it. I've kept it covered when not in use.

See lot 30927 for a companion sequencer from the same seller.

KMR Audio have this on sale for £6,250.

 Age n/a
 Weight n/a
 Condition Near mint
 Location Uk 
 Vat Not from a VAT-registered business. But VAT / duty may be due if importing from outside your trade bloc.
 Quantity 1 item is available from the owner
 Options User manual : No
  Service manual : No
  First owner : No
  Original boxes : No
 Plug type No lead provided
 Voltage type Internal 220-240V power supply
 Status Item is still available
 Sale type The item is on the auction rooms
 Ending on 11/04/2026
 Category Synthesizer (Modular) 
 Serial number 2015/142
 Sphere reference # 30904
 Statistics Created on : 28/03/2026 
Changed on : 29/03/2026 
  Published on : 29/03/2026
  Displayed : 63 time(s) by members and guests  
Safety All electrical items sold in VEMIA are deemed to be trade sales. No warranty of electrical safety is given or implied. Many items are vintage and would not pass current electrical safety standards. It is the responsibility of the buyer to ensure that items are safe to use in their future environment - if necessary by using the services of a professional.

 
     

Prices and conditions    top
The following section gives you the prices as well as shipment and payment conditions associated with the item. Payment is always requested in GBP. Converted price is shown for information and converted with Sphere standard currency rate.

Shipment and Payment links gives you access to an extended description of our rating :
 
 Start price 3180 GBP
 Converted price (1) 3180 GBP
 Shipment International or local shipment to pay
 Packing costs 0 GBP
 Payment Full pre payment needed
 Auction bid step 50 GBP
 Auction highest bid 0 GBP
 Converted highest bid 0 GBP
 Leader or winner *None
 (1) Currency conversion Note that conversion rates were last adjusted on 10th October 2025 at 14:22 CET. They are there to give you a rough guide to the bid price in your currency. Please check for a more up-to-date conversion at https://www.x-rates.com/calculator.html. The bid price will be the actual price in pounds (GBP) at the moment the auction closes. This will be roughly converted to your currency for your information.

For technical reasons, we are unable to update the conversion from GBP to Euro during the auction, although it may change at any time. If you are in the euro zone please check the current rate at https://www.x-rates.com/calculator.html

Payments must always be in GBP. For more info please see the FAQ about exchange rates.https://spheremusic.com/Winfaq.asp?Question=91.

 
     
 
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