diff --git a/include/sst/basic-blocks/dsp/BlockInterpolators.h b/include/sst/basic-blocks/dsp/BlockInterpolators.h
index 2e02f65..73671a8 100644
--- a/include/sst/basic-blocks/dsp/BlockInterpolators.h
+++ b/include/sst/basic-blocks/dsp/BlockInterpolators.h
@@ -227,6 +227,28 @@ template <int maxBlockSize, bool first_run_checks = true> struct alignas(16) lip
         fade_block_to(src21, src22, dst2, bsQuad);
     }
 
+    void fade_blocks_inplace(float *__restrict inAOut, float *__restrict inB) const
+    {
+        for (int i = 0; i < numRegisters; ++i)
+        {
+            auto a = _mm_load_ps(inAOut + (i << 2));
+            auto b = _mm_load_ps(inB + (i << 2));
+            auto sa = _mm_mul_ps(a, _mm_sub_ps(one, line[i]));
+            auto sb = _mm_mul_ps(b, line[i]);
+            auto r = _mm_add_ps(sa, sb);
+            _mm_store_ps(inAOut + (i << 2), r);
+        }
+    }
+
+    void fade_2_blocks_inplace(float *__restrict src11out, float *__restrict src12,
+                               float *__restrict src21out, float *__restrict src22,
+                               int bsQuad = -1) const
+    {
+        assert(bsQuad == -1 || bsQuad == numRegisters);
+        fade_blocks_inplace(src11out, src12);
+        fade_blocks_inplace(src21out, src22);
+    }
+
     void store_block(float *__restrict out, int bsQuad = -1) const
     {
         assert(bsQuad == -1 || bsQuad == numRegisters);
diff --git a/include/sst/basic-blocks/mechanics/block-ops.h b/include/sst/basic-blocks/mechanics/block-ops.h
index 09cf53c..846da92 100644
--- a/include/sst/basic-blocks/mechanics/block-ops.h
+++ b/include/sst/basic-blocks/mechanics/block-ops.h
@@ -79,6 +79,15 @@ inline void add_block(const float *__restrict src1, const float *__restrict src2
     }
 }
 
+template <size_t blocksize>
+inline void add_block(float *__restrict srcdst, const float *__restrict src2)
+{
+    for (auto i = 0U; i < blocksize; ++i)
+    {
+        srcdst[i] = srcdst[i] + src2[i];
+    }
+}
+
 template <size_t blockSize>
 inline void mul_block(float *__restrict src1, float *src2, float *__restrict dst)
 {
@@ -96,6 +105,23 @@ inline void mul_block(float *__restrict src1, float scalar, float *__restrict ds
         dst[i] = src1[i] * scalar;
     }
 }
+
+template <size_t blockSize> inline void mul_block(float *__restrict srcDst, float *__restrict by)
+{
+    for (auto i = 0U; i < blockSize; ++i)
+    {
+        srcDst[i] = srcDst[i] * by[i];
+    }
+}
+
+template <size_t blockSize> inline void mul_block(float *__restrict srcDst, float by)
+{
+    for (auto i = 0U; i < blockSize; ++i)
+    {
+        srcDst[i] = srcDst[i] * by;
+    }
+}
+
 template <size_t blockSize>
 inline void scale_by(const float *__restrict scale, float *__restrict target)
 {