+#define fmod_recv_check \
+ if(spu.s_chan[ch].bFMod==1 && iFMod[ns]) \
+ sinc = FModChangeFrequency(SB, spu.s_chan[ch].iRawPitch, ns)
+
+make_do_samples(default, fmod_recv_check, ,
+ StoreInterpolationVal(SB, sinc, fa, spu.s_chan[ch].bFMod==2),
+ ChanBuf[ns] = iGetInterpolationVal(SB, sinc, *spos, spu.s_chan[ch].bFMod==2), )
+make_do_samples(noint, , fa = SB[29], , ChanBuf[ns] = fa, SB[29] = fa)
+
+#define simple_interp_store \
+ SB[28] = 0; \
+ SB[29] = SB[30]; \
+ SB[30] = SB[31]; \
+ SB[31] = fa; \
+ SB[32] = 1
+
+#define simple_interp_get \
+ if(sinc<0x10000) /* -> upsampling? */ \
+ InterpolateUp(SB, sinc); /* --> interpolate up */ \
+ else InterpolateDown(SB, sinc); /* --> else down */ \
+ ChanBuf[ns] = SB[29]
+
+make_do_samples(simple, , ,
+ simple_interp_store, simple_interp_get, )
+
+static int do_samples_skip(int ch, int ns_to)
+{
+ SPUCHAN *s_chan = &spu.s_chan[ch];
+ int ret = ns_to, ns, d;