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diff --git a/guile/starlet/fixture-library/stairville/octagon-theater-cw-ww.scm b/guile/starlet/fixture-library/stairville/octagon-theater-cw-ww.scm
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+++ b/guile/starlet/fixture-library/stairville/octagon-theater-cw-ww.scm
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+;;
+;; starlet/fixture-library/stairville/octagon-theater-cw-ww.scm
+;;
+;; Copyright © 2020-2022 Thomas White <taw@bitwiz.me.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 octagon-theater-cw-ww)
+  #:use-module (starlet scanout)
+  #:use-module (starlet fixture)
+  #:use-module (starlet attributes)
+  #:use-module (starlet utils)
+  #:export (<stairville-octagon-theater-cw-ww>))
+
+(define-fixture
+
+  <stairville-octagon-theater-cw-ww>
+
+  (fixture-attributes
+    (attr-continuous intensity '(0 100) 0)
+    (attr-continuous colour-temperature '(2800 6400) 3200)
+    (attr-list strobe '(#f #t) #f)
+    ;; FIXME: Strobe frequency is not stated in manual.
+    ;; I've assumed that "slow" means 1 Hz, "fast" 25 Hz
+    (attr-continuous strobe-frequency '(1 25) 1))
+
+  (let ((coltemp (get-attr colour-temperature)))
+    (set-chan8 1 (scale-and-clamp-to-range coltemp '(2800 6400) '(0 255)))
+    (set-chan8 2 (scale-and-clamp-to-range coltemp '(2800 6400) '(255 0))))
+  (if (get-attr strobe)
+      (set-chan8 3 (scale-and-clamp-to-range
+                     (get-attr strobe-frequency)
+                     '(1 25)
+                     '(16 255)))
+      (set-chan8 3 0))
+    (set-chan8 3 0)  ;; Strobe
+  (set-chan8 4 0)  ;; Mode (0-15 = direct control)
+  (set-chan8 5 (percent->dmxval8 (get-attr intensity))))