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diff --git a/guile/starlet/fixture-library/stairville/z120m.scm b/guile/starlet/fixture-library/stairville/z120m.scm
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+;;
+;; starlet/fixture-library/stairville/z120m.scm
+;;
+;; Copyright © 2020-2022 Thomas White <taw@bitwiz.org.uk>
+;;
+;; This file is part of Starlet.
+;;
+;; Starlet is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+;;
+(define-module (starlet fixture-library stairville z120m)
+  #:use-module (starlet scanout)
+  #:use-module (starlet fixture)
+  #:use-module (starlet attributes)
+  #:use-module (starlet utils)
+  #:use-module (starlet colours)
+  #:export (<stairville-z120m-6ch>))
+
+
+(define (colour-as-rgbw-weirdness col weirdness)
+  (let ((rgb (colour-as-rgb col)))
+    (let ((w (* (- 1 weirdness) (apply min rgb))))
+      (list (- (red rgb) w)
+            (- (green rgb) w)
+            (- (blue rgb) w)
+            w))))
+
+
+(define-fixture
+
+  <stairville-z120m-6ch>
+
+  (fixture-attributes
+    (attr-continuous intensity '(0 100) 0)
+    (attr-colour colour white)
+    (attr-continuous strobe-frequency '(1 25) 1)
+    (attr-list strobe '(off on random) 'off)
+    (attr-continuous white-weirdness '(0 100) 0))
+
+  (let ((intensity (get-attr intensity))
+        (rgbw (colour-as-rgbw-weirdness (get-attr colour)
+                                        (/ (get-attr white-weirdness) 100))))
+    (set-chan8 1 (percent->dmxval8 intensity))
+    (set-chan8 3 (percent->dmxval8 (car rgbw)))
+    (set-chan8 4 (percent->dmxval8 (cadr rgbw)))
+    (set-chan8 5 (percent->dmxval8 (caddr rgbw)))
+    (set-chan8 6 (percent->dmxval8 (cadddr rgbw))))
+  (cond
+    ((eq? (get-attr strobe) 'on)
+     (set-chan8 2 (scale-and-clamp-to-range
+                    (get-attr 'strobe-frequency)
+                    '(1 25)
+                    '(106 165))))
+    ((eq? (get-attr strobe) 'random)
+     (set-chan8 2 (scale-and-clamp-to-range
+                    (get-attr strobe-frequency)
+                    '(1 25)
+                    '(181 240))))
+    (else (set-chan8 2 255))))