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In this subroutine https://github.com/snes9xgit/snes9x/blob/master/apu/bapu/dsp/SPC_DSP.cpp#L593 // Gaussian interpolation { int output = interpolate( v ); // Noise if ( m.t_non & v->vbit ) output = (int16_t) (m.noise * 2); // Apply envelope m.t_output = (output * v->env) >> 11 & ~1; v->t_en...

Thanks BearOso :) that is of great help, I am reading them In this https://github.com/snes9xgit/snes9x/blob/master/apu/bapu/dsp/SPC_DSP.cpp#L593 at line 385 inline VOICE_CLOCK( V1 ) { m.t_dir_addr = m.t_dir * 0x100 + m.t_srcn * 4; m.t_srcn = VREG(v->regs,srcn); } should the two statements be reverse...

Hello,

Anyone have the FIR Filter equation in the SPC700 DSP echo block ?
I am interest to know how setting the FIR coefficients will affect the echo feedback.

Thanks