PPM – Peak Program level Meters
This is a Jack tool for visual inspection of the signal chain, identification of drops in peak amplitude. For ex. if you suspect the output is low run “meterbridge -t ppm alsa_pcm:playback_1 alsa_pcm:playback_2” and compare it to the output meter in your playback application. In ppm, 1= -12dB, 4 = 0dB, 7 = +12 dB. More Jack meters can be found at Jack Meterbridge.
July 28th, 2008 at 9:13 am
with jackd > 0.103 the PCM ports are renamed to system:playback_1 etc.
March 5th, 2010 at 7:31 am
Fon’s jmeters is a reimplementation of meterbridge’s ppm and vi meters. It tends to be much more accurate to how the hardware meters would respond. (Also provides stereo versions of the ppm and vu)
http://www.kokkinizita.net/linuxaudio/downloads/index.html