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clip vzfilter freq on init; handling for 0 cfxlen in sampler

--- a/leaf/Src/leaf-filters.c

+++ b/leaf/Src/leaf-filters.c

@@ -1241,7 +1241,7 @@

     LEAF* leaf = f->mempool->leaf;

-    f->fc   = freq;

+    f->fc   = LEAF_clip(0.0f, freq, 0.5f * leaf->sampleRate);

     f->type = type;

     f->G    = ONE_OVER_SQRT2;

     f->invG    = 1.0f/ONE_OVER_SQRT2;

--- a/leaf/Src/leaf-sampling.c

+++ b/leaf/Src/leaf-sampling.c

@@ -383,7 +383,8 @@

                                                     buff[c3],

                                                     buff[c4],

                                                     alpha);

-            crossfadeMix = (float) offset / (float) cfxlen;

+            if (cfxlen > 0.0f) crossfadeMix = (float) offset / (float) cfxlen;

+            else crossfadeMix = 0.0f;

         }

         float flipLength = fabsf(p->flipIdx - p->flipStart);

@@ -525,8 +526,6 @@

         }

     }

-

-    

     p->last = sample;

@@ -705,7 +704,8 @@

                                                      buff[(f4 * p->channels) + 1],

                                                      falpha);

-            flipMix = (float) (cfxlen - flipLength) / (float) cfxlen;

+            if (cfxlen > 0) flipMix = (float) (cfxlen - flipLength) / (float) cfxlen;

+            else flipMix = 1.0f;

         }

     }