I just brought a Quasimidi Sirius from Ebay, and have been having some problems
On switching on (original power supply), I found that on playing sound patches, the parameters were changing randomly (level, detune, cutoff etc). This was happening with every 10 or so notes played.
When switching to another patch, the sound changed instantly, but the readout was taking up to about 15 seconds to show the new patch name and parameters loading. These issued occurred in pattern play also.
I have now re-initialised the synth and plugged the power supply into an outlet not shared with other devices.
It's much better, but is still happening occasionally.
Has anyone encountered a similar problem, or have any ideas what the problem may be?
The synth is cosmetically immaculate and has apparently only seen studio use.