Hello everyone, I’m sorry but I do not know if this is the right place to ask this.
I record with Audacity, but I have a problem.
If you register your metronome to 75bmp for example, listen to the recording along with the metronome, the sounds do not match … this is because the program I change the speed of sound?
Thanks for the answers and sorry English is not correct 
What exactly are you recording - guitar, vocals?
Are you using Click Track http://manual.audacityteam.org/o/man/generate_menu.html#Click_Track… ?
Is the problem that your recording sounds after the beat of the Click Track? If so, have you used Time Shift Tool (F5) to correct it? See http://manual.audacityteam.org/o/man/tools_toolbar.html#timeshift .
You can also read these for more information:
http://manual.audacityteam.org/o/man/faq_recording_troubleshooting.html#sync
http://manual.audacityteam.org/o/man/tutorial_recording_multi_track_overdubs.html
Gale