diff --git a/gnu/local.mk b/gnu/local.mk
index cf42e2b6da..5adea82be4 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1794,6 +1794,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/netsurf-system-utf8proc.patch		\
   %D%/packages/patches/netsurf-y2038-tests.patch		\
   %D%/packages/patches/netsurf-longer-test-timeout.patch	\
+  %D%/packages/patches/neural-amp-modeler-core-fix-eigen-methods.patch	\
   %D%/packages/patches/nhc98-c-update.patch			\
   %D%/packages/patches/nix-dont-build-html-doc.diff		\
   %D%/packages/patches/nfs4-acl-tools-0.3.7-fixpaths.patch	\
diff --git a/gnu/packages/music.scm b/gnu/packages/music.scm
index bc2d7f62f1..e85d917222 100644
--- a/gnu/packages/music.scm
+++ b/gnu/packages/music.scm
@@ -7986,6 +7986,63 @@ (define-public le-biniou
 visuals based on audio performances or existing tracks.")
     (license license:gpl2+)))
 
+(define-public neural-amp-modeler-core
+  (package
+    (name "neural-amp-modeler-core")
+    (version "0.1.0")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/sdatkinson/NeuralAmpModelerCore")
+                    (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "05gfva1qkcq7n7vhvksv1jj5ciag4dp9bbn22svy2xys85mxg0xv"))
+              (patches (search-patches
+                        "neural-amp-modeler-core-fix-eigen-methods.patch"))
+              (modules '((guix build utils)))
+              (snippet #~(begin
+                           (delete-file-recursively "Dependencies")
+                           (substitute* (find-files "NAM" "\\.(h|cpp)$")
+                             (("#include \"Eigen/")
+                              "#include \"eigen3/Eigen/")
+                             (("#include <Eigen/")
+                              "#include <eigen3/Eigen/")
+                             (("#include \"json.hpp\"")
+                              "#include <nlohmann/json.hpp>"))
+                           ;; Remove Clang flags
+                           (substitute* "CMakeLists.txt"
+                             (("-stdlib=libc\\+\\+")
+                              "")
+                             (("add_subdirectory\\(tools\\)")
+                               "\
+file(GLOB_RECURSE NAM_SOURCES ./NAM/*.cpp ./NAM/*.c ./NAM/*.h)
+add_library(neural_amp_modeler SHARED ${NAM_SOURCES})"))))))
+    (build-system cmake-build-system)
+    (arguments
+     (list #:tests? #f ;no tests
+           #:phases #~(modify-phases %standard-phases
+                        (replace 'install
+                          (lambda _
+                            (let ((inc (string-append #$output
+                                                      "/include/NAM"))
+                                  (lib (string-append #$output "/lib")))
+                              (for-each (lambda (file)
+                                          (install-file file lib))
+                                        (find-files "." "\\.so"))
+                              (with-directory-excursion "../source/NAM"
+                                (for-each (lambda (file)
+                                            (install-file file inc))
+                                          (find-files "." "\\.h")))))))))
+    (inputs (list eigen nlohmann-json))
+    (home-page "https://github.com/sdatkinson/NeuralAmpModelerCore")
+    (synopsis "DSP library for NeuralAmpModeler plugins")
+    (description
+     "This package provides the core DSP library for @acronym{NAM, Neural Amp
+Modeler} plugins.")
+    (license license:expat)))
+
 ;;;
 ;;; Avoid adding new packages to the end of this file. To reduce the chances
 ;;; of a merge conflict, place them above by existing packages with similar
diff --git a/gnu/packages/patches/neural-amp-modeler-core-fix-eigen-methods.patch b/gnu/packages/patches/neural-amp-modeler-core-fix-eigen-methods.patch
new file mode 100644
index 0000000000..bcac428a2a
--- /dev/null
+++ b/gnu/packages/patches/neural-amp-modeler-core-fix-eigen-methods.patch
@@ -0,0 +1,15 @@
+Author: Antero Mejr <mail@antr.me>
+
+diff --git a/NAM/lstm.h b/NAM/lstm.h
+index 6b02b18..8da207f 100644
+--- a/NAM/lstm.h
++++ b/NAM/lstm.h
+@@ -23,7 +23,7 @@ class LSTMCell
+ {
+ public:
+   LSTMCell(const int input_size, const int hidden_size, std::vector<float>::iterator& weights);
+-  Eigen::VectorXf get_hidden_state() const { return this->_xh(Eigen::placeholders::lastN(this->_get_hidden_size())); };
++  Eigen::VectorXf get_hidden_state() const { return this->_xh.tail(this->_get_hidden_size()); };
+   void process_(const Eigen::VectorXf& x);
+ 
+ private:
