diff --git a/post_proc/bass_boost.c b/post_proc/bass_boost.c
index f303886..a5c6a4a 100644
--- a/post_proc/bass_boost.c
+++ b/post_proc/bass_boost.c
@@ -31,7 +31,8 @@
         {0x0634f220, 0xddd4, 0x11db, 0xa0fc, { 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b }},
         {0x2c4a8c24, 0x1581, 0x487f, 0x94f6, { 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}}, // uuid
         EFFECT_CONTROL_API_VERSION,
-        (EFFECT_FLAG_TYPE_INSERT | EFFECT_FLAG_DEVICE_IND | EFFECT_FLAG_HW_ACC_TUNNEL),
+        (EFFECT_FLAG_TYPE_INSERT | EFFECT_FLAG_DEVICE_IND | EFFECT_FLAG_HW_ACC_TUNNEL |
+                EFFECT_FLAG_VOLUME_CTRL),
         0, /* TODO */
         1,
         "MSM offload bassboost",
diff --git a/post_proc/bundle.c b/post_proc/bundle.c
index 73b9ae5..f83e231 100644
--- a/post_proc/bundle.c
+++ b/post_proc/bundle.c
@@ -668,10 +668,19 @@
         if (context->ops.set_device)
             context->ops.set_device(context, device);
         } break;
-    case EFFECT_CMD_SET_VOLUME:
+    case EFFECT_CMD_SET_VOLUME: {
+        // if pReplyData is NULL, VOL_CTRL is delegated to another effect
+        if (pReplyData == NULL) {
+            break;
+        }
+        if (pCmdData == NULL || cmdSize != 2 * sizeof(uint32_t) ||
+                replySize == NULL || *replySize < 2*sizeof(int32_t)) {
+            return -EINVAL;
+        }
+        memcpy(pReplyData, pCmdData, sizeof(int32_t)*2);
+        } break;
     case EFFECT_CMD_SET_AUDIO_MODE:
         break;
-
     case EFFECT_CMD_OFFLOAD: {
         output_context_t *out_ctxt;
 
@@ -703,8 +712,6 @@
             add_effect_to_output(out_ctxt, context);
 
         } break;
-
-
     default:
         if (cmdCode >= EFFECT_CMD_FIRST_PROPRIETARY && context->ops.command)
             status = context->ops.command(context, cmdCode, cmdSize,
diff --git a/post_proc/equalizer.c b/post_proc/equalizer.c
index c3a438f..a8e5d1f 100644
--- a/post_proc/equalizer.c
+++ b/post_proc/equalizer.c
@@ -31,7 +31,7 @@
         {0x0bed4300, 0xddd6, 0x11db, 0x8f34, {0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}}, // type
         {0xa0dac280, 0x401c, 0x11e3, 0x9379, {0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}}, // uuid
         EFFECT_CONTROL_API_VERSION,
-        (EFFECT_FLAG_TYPE_INSERT | EFFECT_FLAG_HW_ACC_TUNNEL),
+        (EFFECT_FLAG_TYPE_INSERT | EFFECT_FLAG_HW_ACC_TUNNEL | EFFECT_FLAG_VOLUME_CTRL),
         0, /* TODO */
         1,
         "MSM offload equalizer",
diff --git a/post_proc/reverb.c b/post_proc/reverb.c
index e5fc950..be4d566 100644
--- a/post_proc/reverb.c
+++ b/post_proc/reverb.c
@@ -32,7 +32,7 @@
         { 0xc2e5d5f0, 0x94bd, 0x4763, 0x9cac, { 0x4e, 0x23, 0x4d, 0x06, 0x83, 0x9e } },
         { 0x79a18026, 0x18fd, 0x4185, 0x8233, { 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b } },
         EFFECT_CONTROL_API_VERSION,
-        (EFFECT_FLAG_TYPE_AUXILIARY | EFFECT_FLAG_HW_ACC_TUNNEL),
+        (EFFECT_FLAG_TYPE_AUXILIARY | EFFECT_FLAG_HW_ACC_TUNNEL | EFFECT_FLAG_VOLUME_CTRL),
         0, /* TODO */
         1,
         "MSM offload Auxiliary Environmental Reverb",
@@ -44,7 +44,8 @@
         {0xc2e5d5f0, 0x94bd, 0x4763, 0x9cac, {0x4e, 0x23, 0x4d, 0x06, 0x83, 0x9e}},
         {0xeb64ea04, 0x973b, 0x43d2, 0x8f5e, {0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}},
         EFFECT_CONTROL_API_VERSION,
-        (EFFECT_FLAG_TYPE_INSERT | EFFECT_FLAG_INSERT_FIRST | EFFECT_FLAG_HW_ACC_TUNNEL),
+        (EFFECT_FLAG_TYPE_INSERT | EFFECT_FLAG_INSERT_FIRST | EFFECT_FLAG_HW_ACC_TUNNEL |
+                EFFECT_FLAG_VOLUME_CTRL),
         0, /* TODO */
         1,
         "MSM offload Insert Environmental Reverb",
@@ -56,7 +57,7 @@
         {0x47382d60, 0xddd8, 0x11db, 0xbf3a, {0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}},
         {0x6987be09, 0xb142, 0x4b41, 0x9056, {0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}},
         EFFECT_CONTROL_API_VERSION,
-        (EFFECT_FLAG_TYPE_AUXILIARY | EFFECT_FLAG_HW_ACC_TUNNEL),
+        (EFFECT_FLAG_TYPE_AUXILIARY | EFFECT_FLAG_HW_ACC_TUNNEL | EFFECT_FLAG_VOLUME_CTRL),
         0, /* TODO */
         1,
         "MSM offload Auxiliary Preset Reverb",
@@ -68,7 +69,8 @@
         {0x47382d60, 0xddd8, 0x11db, 0xbf3a, {0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}},
         {0xaa2bebf6, 0x47cf, 0x4613, 0x9bca, {0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}},
         EFFECT_CONTROL_API_VERSION,
-        (EFFECT_FLAG_TYPE_INSERT | EFFECT_FLAG_INSERT_FIRST | EFFECT_FLAG_HW_ACC_TUNNEL),
+        (EFFECT_FLAG_TYPE_INSERT | EFFECT_FLAG_INSERT_FIRST | EFFECT_FLAG_HW_ACC_TUNNEL |
+                EFFECT_FLAG_VOLUME_CTRL),
         0, /* TODO */
         1,
         "MSM offload Insert Preset Reverb",
diff --git a/post_proc/virtualizer.c b/post_proc/virtualizer.c
index 40bbf38..b9e4fb9 100644
--- a/post_proc/virtualizer.c
+++ b/post_proc/virtualizer.c
@@ -31,7 +31,8 @@
         {0x37cc2c00, 0xdddd, 0x11db, 0x8577, {0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}},
         {0x509a4498, 0x561a, 0x4bea, 0xb3b1, {0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}}, // uuid
         EFFECT_CONTROL_API_VERSION,
-        (EFFECT_FLAG_TYPE_INSERT | EFFECT_FLAG_DEVICE_IND | EFFECT_FLAG_HW_ACC_TUNNEL),
+        (EFFECT_FLAG_TYPE_INSERT | EFFECT_FLAG_DEVICE_IND | EFFECT_FLAG_HW_ACC_TUNNEL |
+                EFFECT_FLAG_VOLUME_CTRL),
         0, /* TODO */
         1,
         "MSM offload virtualizer",