Hi MarkT
I have found one place in the HL1606strip.cpp where there stand:
HL1606strip::HL1606strip(int dPin, int latchPin, int clkPin, uint8_t numLEDs)
{
_dPin = dPin;
_sPin = 255;
_latchPin = latchPin;
_clkPin = clkPin;
_faderEnabled = 0;
But changing from 255 to 320, makes no difference. 