IPA symbols

I'm working on a phonology for Ndizvozvo -- my newest project.

I know that some langs contrast velar stops /k/,/q/ and /g/, /G/.
Ndizvozvo does this too, but preserves the contrast in the velar nasals.
Does anyone know IPA symbols contrasing front and back eng's?

Also, the contrast is preserved in the velar fricatives and ideas
about symbols for contrasting fronted and backed voiced and unvoiced
velars?

Finally, anyone know the symbols for the sounds Shona (a Bantu lang)
spells "zv" and "dzv" and the symbols for the voiceless counterparts?

Thanks for any help you can give!

Adam Walker

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