I have a Hampstead Subspace, and recently when is engaged I noticed that if the settings are set very high there is a very slight distorting to the signal, meaning that even when not engaged the signal is no longer clean. It can be reduced by turning everything down, eg gain, active bass and treble controls and the level (as well as input multiplier). It's very odd. Hampstead tested it themselves and could not replicate it.
What could cause this kind of behaviour? Essentially its as if the circuit still has signal going through it and a tiny bit is feeding back into the dry signal. Hampstead say it has never happened before, and since they cannot replicate it, it makes me think that perhaps its something to do with my set up, be it a power supply (1spot cs7) or amplifier issue (Orange tremlord 30).
Any thoughts welcomed!