diff --git a/src/model_menus.cpp b/src/model_menus.cpp
index eb3ecc0cf..63ab921a9 100644
--- a/src/model_menus.cpp
+++ b/src/model_menus.cpp
@@ -1567,22 +1567,22 @@ void menuProcMixOne(uint8_t event)
       case MIX_FIELD_DELAY_UP:
         lcd_putsLeft(y, STR_DELAYUP);
         lcd_outdezAtt(MIXES_2ND_COLUMN,y,md2->delayUp,attr|LEFT);
-        if(attr)  CHECK_INCDEC_MODELVAR( event, md2->delayUp, 0, 15);
+        if(attr)  CHECK_INCDEC_MODELVAR( event, md2->delayUp, 0, MAX_DELAY);
         break;
       case MIX_FIELD_DELAY_DOWN:
         lcd_putsLeft(y, STR_DELAYDOWN);
         lcd_outdezAtt(MIXES_2ND_COLUMN,y,md2->delayDown,attr|LEFT);
-        if(attr)  CHECK_INCDEC_MODELVAR( event, md2->delayDown, 0, 15);
+        if(attr)  CHECK_INCDEC_MODELVAR( event, md2->delayDown, 0, MAX_DELAY);
         break;
       case MIX_FIELD_SLOW_UP:
         lcd_putsLeft(y, STR_SLOWUP);
         lcd_outdezAtt(MIXES_2ND_COLUMN,y,5*md2->speedUp,attr|PREC1|LEFT);
-        if(attr)  CHECK_INCDEC_MODELVAR( event, md2->speedUp, 0, 15);
+        if(attr)  CHECK_INCDEC_MODELVAR( event, md2->speedUp, 0, MAX_SLOW);
         break;
       case MIX_FIELD_SLOW_DOWN:
         lcd_putsLeft(y, STR_SLOWDOWN);
         lcd_outdezAtt(MIXES_2ND_COLUMN,y,5*md2->speedDown,attr|PREC1|LEFT);
-        if(attr)  CHECK_INCDEC_MODELVAR( event, md2->speedDown, 0, 15);
+        if(attr)  CHECK_INCDEC_MODELVAR( event, md2->speedDown, 0, MAX_SLOW);
         break;
     }
   }
diff --git a/src/myeeprom.h b/src/myeeprom.h
index 3cb7de258..ec176c78a 100644
--- a/src/myeeprom.h
+++ b/src/myeeprom.h
@@ -239,11 +239,13 @@ enum MixSources {
 #define TRIM_THR   -3
 #define TRIM_AIL   -4
 
-#define MLTPX_ADD  0
-#define MLTPX_MUL  1
-#define MLTPX_REP  2
+#define MLTPX_ADD   0
+#define MLTPX_MUL   1
+#define MLTPX_REP   2
 
 #if defined(PCBARM)
+#define MAX_DELAY   60 /* 30 seconds */
+#define MAX_SLOW    60 /* 30 seconds */
 PACK(typedef struct t_MixData {
   uint8_t destCh;
   int8_t  phase;
@@ -258,10 +260,12 @@ PACK(typedef struct t_MixData {
   uint8_t speedDown;       // 0 nichts
   uint8_t srcRaw;         //
   int8_t  differential;
-  int8_t carryTrim;
+  int8_t  carryTrim;
   int8_t  sOffset;
 }) MixData;
 #else
+#define MAX_DELAY   15 /* 7.5 seconds */
+#define MAX_SLOW    15 /* 7.5 seconds */
 PACK(typedef struct t_MixData {
   uint8_t destCh:4;          // 0, 1..NUM_CHNOUT
   int8_t  phase:4;           // -5=!FP4, 0=normal, 5=FP4