I need to edit the pyschoacoustic routine so that a number of txt files are generated. Within these txt files, masking values and tonality value etc will be stored.

I have been looking through the code and I am a bit lost. Could anyone provide me with some help or documentation to aid me?

Thanks

Most of what you are looking for is in psymodel.c.

My guess is that you might want to output:
*energy of sub short blocks (around line 1460)
*usage of short or long block (line 1480)
*short block masking (1499)
*tonality and masking of long blocks (1627)
*PE values (1696)

edit: a good start might be to search for the
#if defined(HAVE_GTK)
lines. Those are for the frame analyser. You might want to output similar things to your text file.

thanks, I have outputted fftenergy[j] (line 314), do you think this is something useful?