bl00mbox: background callback fix, mixer behavior change

components/bl00mbox/micropython/mp_sys_bl00mbox.c

@@ -292,7 +292,7 @@ STATIC mp_obj_t mp_channel_core_make_fake(mp_obj_t self_in) {
     fake->fake = true;
     fake->channel_plugin = self->channel_plugin;
 #ifdef BL00MBOX_CALLBACKS_FUNSAFE
-    fake->callback = self->callback;
+    fake->callback = MP_OBJ_NULL;
 #endif
     return MP_OBJ_FROM_PTR(fake);
 }
@@ -372,7 +372,7 @@ STATIC void channel_core_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
             bl00mbox_channel_set_foreground(chan, mp_obj_is_true(dest[1]));
 #ifdef BL00MBOX_CALLBACKS_FUNSAFE
         } else if (attr == MP_QSTR_callback) {
-            self->callback = dest[1];
+            ((channel_core_obj_t *)chan->parent)->callback = dest[1];
 #endif
         } else {
             attr_exists = false;
@@ -395,7 +395,7 @@ STATIC void channel_core_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
             dest[0] = self->channel_plugin;
         } else if (attr == MP_QSTR_callback) {
 #ifdef BL00MBOX_CALLBACKS_FUNSAFE
-            dest[0] = self->callback;
+            dest[0] = ((channel_core_obj_t *)chan->parent)->callback;
 #else
             dest[0] = mp_const_none;
 #endif

components/bl00mbox/radspa/standard_plugin_lib/mixer.c

@@ -25,10 +25,8 @@ void mixer_run(radspa_t * mixer, uint16_t num_samples, uint32_t render_pass_id){
 
     for(uint8_t j = 0; j < data->num_inputs; j++){
         int32_t input_gain_const = radspa_signal_get_const_value(input_gain_sigs[j], render_pass_id);
-        // load bearing bug, figure out how to migrate to this behavior gracefully before uncommenting: 
-        // if(!input_gain_const) continue;
+        if(!input_gain_const) continue;
         int32_t input_const = radspa_signal_get_const_value(input_sigs[j], render_pass_id);
-        if(!input_gain_const) continue; // remove when uncommenting two lines above
         if(!input_const) continue;
         if((input_const != RADSPA_SIGNAL_NONCONST) && (input_gain_const != RADSPA_SIGNAL_NONCONST)){
             if(ret_init){