diff --git a/examples/lib/lib_synth_shed/synth_shed.c b/examples/lib/lib_synth_shed/synth_shed.c
index 1fa5760..6dc2b7c 100644
--- a/examples/lib/lib_synth_shed/synth_shed.c
+++ b/examples/lib/lib_synth_shed/synth_shed.c
@@ -46,13 +46,12 @@ SYNTH_STATUS synth_create(synth_t **new_synth, const char *brand, const char *mo
 
 SYNTH_STATUS synth_set_osc_count(synth_t *synth, int osc_count) {
     assert(synth);
-    SYNTH_STATUS status = 0;
     if (osc_count < 0) {
-        status = 1;
+        return SYNTH_STATUS_ARG_ERR;
     } else {
         synth->osc_count = osc_count;
     }
-    return status;
+    return SYNTH_STATUS_OK;
 }
 
 
@@ -87,9 +86,9 @@ const char *tech_to_string(const enum _tech *tech) {
 }
 
 
-SYNTH_STATUS filtertype_to_string(const filtertype_t *const filt, char **ftstr) {
+SYNTH_STATUS filtertype_to_string(const filtertype_t *const filt,const char **ftstr) {
     assert(filt);
-    char *_ftstr = "unknown filtertype";
+    const char *_ftstr = "unknown filtertype";
     if (filt == NULL) {
         return SYNTH_STATUS_ARG_ERR;
     }
@@ -126,7 +125,7 @@ const char *play_synth(synth_t *synth) {
     const char *filtertype_str[3] = {"", "", ""};
 
     for (int i = 0; i < 3; i++) {
-        filt_tech[i] = tech_to_string(&synth->filter[i].technology);
+        (filt_tech[i]) = tech_to_string(&synth->filter[i].technology);
 
         SYNTH_STATUS status = filtertype_to_string(&synth->filter[i].type, &filtertype_str[i]);
         if (status != SYNTH_STATUS_OK) {
diff --git a/examples/lib/lib_synth_shed/synth_shed.h b/examples/lib/lib_synth_shed/synth_shed.h
index 1033bd5..17820c3 100644
--- a/examples/lib/lib_synth_shed/synth_shed.h
+++ b/examples/lib/lib_synth_shed/synth_shed.h
@@ -58,7 +58,7 @@ const char* status_to_string(SYNTH_STATUS status);
 
 const char* tech_to_string(const enum _tech* tech);
 
-SYNTH_STATUS filtertype_to_string(const filtertype_t* const filt, char** ftstr);
+SYNTH_STATUS filtertype_to_string(const filtertype_t* const filt,const char** ftstr);
 
 const char* play_synth(synth_t* synth);