Just realised you can buy a BMW E46 gong from its PDC for little money on Ebay. There's a few videos showing which pins produce what tones depending on which ones you wire. Looks simple enough, I'll have a go at it.
https://www.youtube.com/watch?v=pxnlJAvyr5s
Pretty much what I want. One of the pins (the one on its own at the far right) is a parking sensor beep that doesn't fade.
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Porsche Boxster S Type 986
Bi-xenon Headlight Upgrade | 987 S 18" Anthracite Alloys | Android Head Unit | 5000k 55w HID's | 5000k Cree DRL's | 5000k Cree number plate lights | Cree LED Indicators | One-touch roof operation | Bypass exhaust pipes | Parking sensors | Ambient footwell lighting
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