No, no, no.I have heard a pitch change which was attributed to a family members gas issues.
Hi Ralph. IMHO, I think John's arse is his source.Please quote your source.
Ha ha, perhaps! It was nice once the pump was working and I could look in the tank viewport and correlate the tank draining with the sound of the macerator and see that when the tank is getting empty the thing really starts whining at a high pitch. Now I know when to turn it offHi Ralph. IMHO, I think John's arse is his source.