gnu: Add regrader.

* gnu/packages/music.scm (regrader): New variable.

Signed-off-by: Marius Bakke <mbakke@fastmail.com>

gnu/packages/music.scm

@@ -5332,3 +5332,28 @@ based on source code by PolyValens, offered as an LV2 plugin and a
 standalone JACK application.")
     ;; Expat or CC0
     (license (list license:expat license:cc0))))
+
+(define-public regrader
+  (package
+    (inherit vl1-emulator)
+    (name "regrader")
+    (version "1.0.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/linuxmao-org/regrader.git")
+             (commit (string-append "v" version))
+             ;; bundles a specific commit of the DISTRHO plugin framework
+             (recursive? #t)))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "0gl4d5lf2afqknz22jz7hh7029sc9v1xrz6nbz9dlv42bwc0cvl0"))))
+    (home-page "https://github.com/linuxmao-org/regrader")
+    (synopsis "Delay effect plugin")
+    (description
+     "Regrader is a delay effect where the repeats degrade in resolution.
+This is an unofficial port of the Regrader plugin created by Igorski.  It
+is available as an LV2 plugin and a standalone JACK application.")
+    (license license:expat)))