Well, Ok, Thank you for your reply.

If you say this is a normal level for this unit, then that is fine with me, I did not want it to be a fault that became progressively louder within time.

Best wishes to all and thanks again for your advice.

--- In Doepfer_a100@yahoogroups.com , Florian Anwander wrote:
>
> On 13.02.13 22:17 , isoldeandisobelle wrote:
> > Here is the soundcloud link - https://soundcloud.com/isolde-and-isobelle/a-107
> >
> > First with a sawtooth and then just the filter out as I turn through the filter presets....it is also more noticeable with something like a sine.
> I don't own a A_107, but I even could imagine, that this is the normal
> noise level at certain filtersettings. Especially if high pass filters
> are placed as last part of the filteralgorithm. Dieter may jump in here.
> Perhaps the bandpasses are generated using LP->HP instead of HP->LP.
>
> Florian
>