diff --git a/Software/GuitarPedal/Hardware-Modules/base_hardware_module.cpp b/Software/GuitarPedal/Hardware-Modules/base_hardware_module.cpp
index a244da1b..c4b40822 100644
--- a/Software/GuitarPedal/Hardware-Modules/base_hardware_module.cpp
+++ b/Software/GuitarPedal/Hardware-Modules/base_hardware_module.cpp
@@ -1,4 +1,5 @@
 #include "base_hardware_module.h"
+#include <cstring>
 
 using namespace daisy;
 using namespace bkshepherd;
@@ -203,6 +204,10 @@ void BaseHardwareModule::InitEncoders(int count, Pin pins[][3]) {
 void BaseHardwareModule::InitLeds(int count, Pin pins[]) {
     for (int i = 0; i < count; i++) {
         Led newLed;
+        // libDaisy's Led::Init() never initialises the software-PWM phase (pwm_), and Led's constructor does nothing, so a stack-allocated
+        // Led starts with whatever was left on the stack. Depending on the compiler/optimiser that can be a huge or NaN value, which keeps
+        // the LED permanently off (or on). Zero the whole object first so the PWM phase starts at 0.
+        std::memset(static_cast<void *>(&newLed), 0, sizeof(newLed));
         newLed.Init(pins[i], false, AudioCallbackRate());
         leds.push_back(newLed);
     }
diff --git a/Software/GuitarPedal/Makefile b/Software/GuitarPedal/Makefile
index 078c33a1..8f431e98 100644
--- a/Software/GuitarPedal/Makefile
+++ b/Software/GuitarPedal/Makefile
@@ -147,24 +147,3 @@ ifdef VARIANT
    CFLAGS += -DVARIANT_$(VARIANT)
    $(info VARIANT=$(VARIANT))
 endif
-
-
-# --- ARM SDK Version check --- [start]
-# Issues have been experienced with the latest version of arm-none-eabi-gcc, so
-# we add a check here to help guide users to use a supported version
-
-# Determine which compiler to check (use GCC_PATH if set, otherwise system default)
-GCC_CHECK := arm-none-eabi-gcc
-ifdef GCC_PATH
-  GCC_CHECK := $(GCC_PATH)/arm-none-eabi-gcc
-endif
-
-# Get compiler version string safely
-GCC_VERSION := $(shell $(GCC_CHECK) -dumpversion)
-GCC_VERSION_MAJOR := $(word 1, $(subst ., ,$(GCC_VERSION)))
-GCC_VERSION_MAJOR_REQUIRED := 10
-
-ifneq ($(GCC_VERSION_MAJOR),$(GCC_VERSION_MAJOR_REQUIRED))
-$(error Compiler version of arm-none-eabi-gcc: $(GCC_VERSION) is not supported. Use version $(GCC_VERSION_MAJOR_REQUIRED).x.x)
-endif
-# --- ARM SDK Version check --- [end]
\ No newline at end of file
diff --git a/Software/GuitarPedal/README.md b/Software/GuitarPedal/README.md
index aa780972..767b6d4b 100644
--- a/Software/GuitarPedal/README.md
+++ b/Software/GuitarPedal/README.md
@@ -12,11 +12,10 @@ Before you can use the software you'll need to do the following steps. There is
 
 The code in this project is supplied with a Microsoft Visual Code project and depends on both **LibDaisy** and **DaisySP** from Electro-Smith. Detailed instructions on setting these up for your dev environment can be found here:
 
-https://electro-smith.github.io/libDaisy/index.html
+https://docs.daisy.audio/tutorials/cpp-dev-env/
 
-Some issues have been reported with newer ARM compiler versions. The documentation above from Electrosmith should be complete but for reference many users have had success with `10.3-2021.10`
-
-Version can be checked with `arm-none-eabi-gcc --version`
+Note: previously gcc 10 compiler was enforced by build system, the reasons for this should no longer be valid and the 
+compiler recommended by daisy.audio should work fine. 
 
 ### 2. Setup dependencies