日本語 Japanese Ask Questions Thread 3

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Japanese Ask Questions Thread2
http://dis.4chan.org/read/lang/1206158123/1-40

I'm having a bit of a problem with listening. Sometimes I hear G as N. I'll listen to the audio again and again but I can't hear even a hint of a G. I've managed to find an example:
http://assets0.smart.fm/assets/legacy/JLL/audio/JW05835A.mp3
This is meant to be つぎ　but all I can hear つに.
I managed to find some info on Wikipedia ( http://en.wikipedia.org/wiki/Japanese_phonology#Weakening ) but it's still pretty confusing. Am I just supposed to assume that any N i hear in the middle of a word could be a G and figure it out from context or will I improve as I listen to more Japanese?
Thanks!