Does anybody know of an accurate mono or stereo VU meter?

Abstraction or external.

Using env~ with the Pd internal level meter works but I don't seem to have any reference of the real peak or RMS level.

The only thing I could do is sending some test signals from the SPDIF out to my RME sound card and tweak the level to match 0dB.

But there should be an accurate level calculation directly within Pd …

I'm on Pd 0.49 on Debian.

Thank you!

Ingo