I bought an external audio card M-AUDIO Fast Track Pro to work with a Macbook 2.0 GHz Intel Core 2 Duo and with Pd extended 0.39. When I plug a guitar and a microphone using adc~ Pd object I noticed a significant signal latency. Even using JackPilot and after reduce the delay to 10ms in portaudio, the latency maintains. Is M-audio not good enough to play real time audio or working with Pd? How can I resolve the latency problem? What are the best external audio cards to play in real time with this set up?
Greeting,
Pp2007.pt

Did you turn jack on in the Media menu? I use an MBox2 Pro for my guitar and used to have more latency until I realized I still had portaudio checked in the menu. You might need a newer version of Pd-extended, though, as it did crash in .39 when turning on jack on OSX.

I reduced a little beat latency going to JackPilot Preferences and changing Sample Rate to 48000 Khz and decreasing Buffer Size to 128. But I am not satisfied yet because sometimes I notice cracking noises.
Greetings,
Pp2007.pt