I am finding that if I use a tap vector length of greater than 4 the
code stops working. Instead of a tone I get no noise.
You may be getting instabilities, which is common with high order IIR
filters. However, Just to make sure the problem isn't the code, try
making a 2 tap filter and instantiate it as a 4 tap, setting the other
taps to 0 or 1 as appropriate.
If you find that instability is the problem, you are better off breaking
your filter into cascaded biquad sections. Matlab should be able to do
that for you.
Matt
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