Will try to do another recording with some different device, as this phone seems to be ignoring the normal diesel rumble when the whistle/whine starts (might be part of some noise-cancellation algorythm, as I supposed the recording software is primarily intended to record speech).
Alright, here is a real recording: http://www.file-upload.net/download-...-warm.wav.html
The engine was still warm, but after like half an hour of sitting. There are three turbo whistles in the recording - first when revving suddenly to 3000 rpm, the second when revving suddenly to 4000 rpm, the third while revving gradually to 3000 rpm.
In the meanwhile, I also compared the sound of my turbo to a 1.9 Alfa GT and to a 1.9 Skoda Superb (the old VW 130 bhp engine). Mine is louder than both, but I'm still not convinced I should keep my habit of spending 4-500 EUR on a monthly basis for repairs / replacements... Any opinions (not necessarily about my spending habits, but for the need to replace the turbo)?