Fixed a bug that causes invalid effect output

[KKQ-KKQ]

The tempMixSpan didn't reset at a loop. This cause an issue with the following sfz example.

<effect>
bus=fx1 type=fverb reverb_type=mid_hall reverb_dry=80 reverb_wet=20 reverb_input=40 reverb_size=0 reverb_predelay=0.01 reverb_tone=50 reverb_damp=50 fx1tomix=100
<global>
effect1=100
<region>sample=*sine
ampeg_attack=0.02 ampeg_release=0.1
output=0
<region>sample=*saw
ampeg_attack=0.02 ampeg_release=0.1
output=3

The 2nd and the 3rd output should be silent but actually it sounds.

[paulfd]

Nice catch thanks!