[AviSynth] Scripting: how to choose an audio track?

[Freodon]

I have an AviSynth script:

LoadPlugin("E:\AviSynth 2.5\plugins\ffms2.dll")
A = FFAudioSource("E:\AviSynth 2.5\scripts\1.mkv")
V = FFVideoSource("E:\AviSynth 2.5\scripts\1.mkv")
AudioDub(V,A)
(...) 

But in the mkv file, there are two different audio tracks, and it chooses the one with ID 1 by default. How do I make it so that it chooses track ID 2? I know I can just remove the first track with mkvmerge, but I have quite a lot of files and it would be very time consuming to mux every one of them one by one.

[jagabo]

In FFAudioSource() add track=2.

[Freodon]

In FFAudioSource() add track=2.

Thanks, will try that.