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Update FEATURES.in

Introduce a new category "Low-level signal processing effects"
(loosely defined as effects that require the user to have a basic
understanding of DSP in order to be useful). Move biquad and fir to
this category, add downsample and upsample.

--- a/FEATURES.in

+++ b/FEATURES.in

@@ -54,9 +54,7 @@

 ** bandreject: RBJ band-reject biquad IIR filter

 ** band: SPKit resonator band-pass IIR filter

 ** bass: Tone control: RBJ shelving biquad IIR filter

-** biquad: 2nd-order IIR filter using externally provided coefficients

 ** equalizer: RBJ peaking equalisation biquad IIR filter

-** fir: FFT convolution FIR filter using externally provided coefficients

 ** firfit+: FFT convolution FIR filter using given freq. response (W.I.P.)

 ** highpass: High-pass filter: Single pole or RBJ biquad IIR

 ** hilbert: Hilbert transform filter (90 degrees phase shift)

@@ -130,6 +128,12 @@

 ** synth: Synthesise/modulate audio tones or noise signals

 ** newfile: Create a new output file when an effects chain ends.

 ** restart: Restart 1st effects chain when multiple chains exist.

+

+* Low-level signal processing effects

+** biquad: 2nd-order IIR filter using externally provided coefficients

+** downsample: Reduce sample rate by discarding samples

+** fir: FFT convolution FIR filter using externally provided coefficients

+** upsample: Increase sample rate by zero stuffing

   + Experimental or incomplete effect; may change in future.