diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3e0509e..93922b9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,10 +1,10 @@
 cmake_minimum_required(VERSION 3.16.0)
 project(pipedal 
-    VERSION 1.3.65
+    VERSION 1.3.66
     DESCRIPTION "PiPedal Guitar Effect Pedal For Raspberry Pi"
     HOMEPAGE_URL "https://rerdavies.github.io/pipedal"
 )
-set (DISPLAY_VERSION "PiPedal v1.3.65-Experimental")
+set (DISPLAY_VERSION "PiPedal v1.3.66-Release")
 set (PACKAGE_ARCHITECTURE "arm64")
 set (CMAKE_INSTALL_PREFIX "/usr/")
 
diff --git a/README.md b/README.md
index 5c4f073..4ed6b75 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 <a href="https://rerdavies.github.io/pipedal/LicensePiPedal.html"><img src="https://img.shields.io/badge/MIT-MIT?label=license&color=%23808080"/></a>
 <a href="https://github.com/rerdavies/pipedal/actions"><img src="https://img.shields.io/github/actions/workflow/status/rerdavies/pipedal/cmake.yml?branch=main"/></a>
 
-Download:&nbsp;<a href='https://rerdavies.github.io/pipedal/download.html'>v1.3.65</a> 
+Download:&nbsp;<a href='https://rerdavies.github.io/pipedal/download.html'>v1.3.66</a> 
 Website:&nbsp;[https://rerdavies.github.io/pipedal](https://rerdavies.github.io/pipedal).
 Documentation:&nbsp;[https://rerdavies.github.io/pipedal/Documentation.html](https://rerdavies.github.io/pipedal/Documentation.html).
 
@@ -17,7 +17,7 @@ Documentation:&nbsp;[https://rerdavies.github.io/pipedal/Documentation.html](htt
 &nbsp;
 
 
-#### NEW version 1.3.65 Release, providing [snapshots](https://rerdavies.github.io/pipedal/Snaphots.html), and a new Performance View. See the [release notes](https://rerdavies.github.io/pipedal/ReleaseNotes) for details.
+#### NEW version 1.3.66 Release, providing [snapshots](https://rerdavies.github.io/pipedal/Snaphots.html), and a new Performance View. See the [release notes](https://rerdavies.github.io/pipedal/ReleaseNotes) for details.
 
 &nbsp;
 
diff --git a/docs/Installing.md b/docs/Installing.md
index 0557401..f036a80 100644
--- a/docs/Installing.md
+++ b/docs/Installing.md
@@ -13,17 +13,17 @@ page_icon: img/Install4.jpg
 
 Download the most recent Debian (.deb) package for your platform:
 
-- [Raspberry Pi OS bookworm (64-bit) v1.3.65](https://github.com/rerdavies/pipedal/releases/download/)
+- [Raspberry Pi OS bookworm (64-bit) v1.3.66](https://github.com/rerdavies/pipedal/releases/download/)
 - [Ubuntu/Raspberry Pi OS bullseyeye (64-bit) v1.2.31](https://github.com/rerdavies/pipedal/releases/download/v1.1.31/pipedal_1.1.31_arm64.deb)
 
-Version 1.3.65 has not yet been tested on Ubuntu or Raspberry Pi OS bullseye. On these platforms, we recommend that you use version 1.1.31.
+Version 1.3.66 has not yet been tested on Ubuntu or Raspberry Pi OS bullseye. On these platforms, we recommend that you use version 1.1.31.
 
 Install the package by running 
 
 ```
   sudo apt update
   cd ~/Downloads  
-  sudo apt-get install pipedal_1.3.65_arm64.deb 
+  sudo apt-get install pipedal_1.3.66_arm64.deb 
 ```
 Adjust accordingly if you have downloaded v1.1.31.
 
diff --git a/docs/ReleaseNotes.md b/docs/ReleaseNotes.md
index d4465d7..d3e1703 100644
--- a/docs/ReleaseNotes.md
+++ b/docs/ReleaseNotes.md
@@ -1,5 +1,15 @@
 # Release Notes
 
+## PiPedal 1.3.66 Release
+
+Bug fixes:
+- Choose 24-bit or 32-bit audio formats instead of 16-bit audio formats on devices that support both.
+- Force selection of stereo channel configuration for legacy I2C audio drivers without support for channel maps.
+- Avoid selection of hardware-downmixed Surround Sound channel configurations.
+
+Minor features:
+- Improved diagnostic tools for ALSA devices via `pipedalconfig --alsa-devices`
+
 ## PiPedal 1.3.64 Beta
 
 Bug fixes:
diff --git a/docs/download.md b/docs/download.md
index 7a873eb..719359e 100644
--- a/docs/download.md
+++ b/docs/download.md
@@ -4,7 +4,7 @@
 
 Download the most recent Debian (.deb) package for your platform:
 
-- <a href="https://github.com/rerdavies/pipedal/releases/download/v1.3.65/pipedal_1.3.65_arm64.deb">Raspberry Pi OS Bookworm (64-bit) v1.3.65</a>
+- <a href="https://github.com/rerdavies/pipedal/releases/download/v1.3.66/pipedal_1.3.66_arm64.deb">Raspberry Pi OS Bookworm (64-bit) v1.3.66</a>
 
 
 Install the package by running 
@@ -12,7 +12,7 @@ Install the package by running
 ```
   sudo apt update
   cd ~/Downloads  
-  sudo apt-get install ./pipedal_1.3.65_arm64.deb
+  sudo apt-get install ./pipedal_1.3.66_arm64.deb
 ```
 
 Follow the instructions in [_Configuring PiPedal After Installation_](https://rerdavies.github.io/pipedal/Configuring.html) to complete the installation.
diff --git a/docs/index.md b/docs/index.md
index 4e2a70c..cd88660 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -1,7 +1,7 @@
 
 
 <img src="GithubBanner.png" width="100%"/>
-<a href="Installing.html"><i>v1.3.65</i></a>
+<a href="Installing.html"><i>v1.3.66</i></a>
 
 &nbsp;
 
@@ -12,7 +12,7 @@ To view PiPedal documentation, click [here](Documentation.md).
 
 &nbsp;
 
-#### NEW version 1.3.65 Release. See the [release notes](https://rerdavies.github.io/pipedal/ReleaseNotes) for details.
+#### NEW version 1.3.66 Release. See the [release notes](https://rerdavies.github.io/pipedal/ReleaseNotes) for details.
 
 &nbsp;