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In article writes:

and one of this is EMU 0404 - did not measure
just play with VST istruments
but if You have some simple way to mesure latency i can test few cards
and poot result here

There are a number of things that are called "latency." The thing that
concerns me most is the time between when audio (like a microphone)
hits the input and when it comes out the monitor output. You can
measure this by putting something with a short rise time (a cross
stick sound is good) into one channel, and connect the output of that
channel to the input of another channel. Record a few seconds on both
channels. Stop the recording, zoom in on the waveform of the two
channels, and measure the time difference between them. That's the
input/output latency.

Latency when playing samples is trickier because it depends on the
program that's supporting the VST instrument. If you have a MIDI
keyboard with sounds you could choose a similar sound on the keyboard
and from the VST library, connect the analog output of the sample
playback channel to one input, connect the synth output to another
input, play your sound, record it to two tracks, and look at the time
difference between the tracks. That's not totally accurate but it will
get you a ballpark measurement.

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