diff --git a/README.md b/README.md
index d86cc03..ecf32ec 100644
--- a/README.md
+++ b/README.md
@@ -2,12 +2,21 @@
 
 OBS control from D-Bus messages
 
-Send a D-Bus signal to perform an operation with `src/obsdc-signal`, which takes a single operation name
-as an argument.
+Send a D-Bus signal to perform an operation with `src/obsdc-signal`, which takes a single operation command
+as an argument, and performs an action in OBS.
 
 ## Operations
 
-See [Op](src/main/kotlin/net/eksb/obsdc/Op.kt) for a list of operations.
+* `SCENE_NEXT` - switch to the next scene
+* `SCENE_PREV` - switch to the previous scene
+* `SCENE_#` - switch to the indicated scene
+  * replace `#` with scene index, starting with 1.
+* `STUDIO_TRANSITION` - transition the studio preview and program
+* `STUDIO_MODE_TOGGLE` - toggle studio mode
+* `PAN_UP` - move the top unlocked source up 50px
+* `PAN_DOWN` - move the top unlocked source down 50px
+* `PAN_LEFT` - move the top unlocked source left 50px
+* `PAN_RIGHT` - move the top unlocked source right 50pxt
 
 ## Configuration
 
diff --git a/src/main/kotlin/net/eksb/obsdc/DBus.kt b/src/main/kotlin/net/eksb/obsdc/DBus.kt
index 1a7e58c..51db7b0 100644
--- a/src/main/kotlin/net/eksb/obsdc/DBus.kt
+++ b/src/main/kotlin/net/eksb/obsdc/DBus.kt
@@ -19,7 +19,7 @@ import org.slf4j.LoggerFactory
  *
  * `src/scripts/obsdc-signal` takes an [Op] name and sends the signal.
  */
-class DBus(private val opRunner:OpRunner): AutoCloseable {
+class DBus(private val opHandler:(String)->Unit): AutoCloseable {
 
 	// To monitor DBUS: `dbus-monitor`
   // To see what is registered: `qdbus net.eksb.obsdc /`
@@ -37,9 +37,7 @@ class DBus(private val opRunner:OpRunner): AutoCloseable {
 
 		dbus.addSigHandler<ObsdcDBusInterface.Signal> { signal ->
 			log.debug("signal: ${signal.op}")
-			val op = Op.valueOf(signal.op)
-			log.debug("op: ${op}")
-			opRunner.run(op)
+			opHandler.invoke(signal.op)
 		}
 		log.debug("DBUS initialized")
 	}
diff --git a/src/main/kotlin/net/eksb/obsdc/Op.kt b/src/main/kotlin/net/eksb/obsdc/Op.kt
deleted file mode 100644
index 891c05a..0000000
--- a/src/main/kotlin/net/eksb/obsdc/Op.kt
+++ /dev/null
@@ -1,27 +0,0 @@
-package net.eksb.obsdc
-
-enum class Op {
-	/** If in studio mode, transition between scenes. */
-	STUDIO_TRANSITION,
-	/** Enable/disable studio mode. */
-	STUDIO_MODE_TOGGLE,
-	/** Activate the previous scene. */
-	SCENE_PREV,
-	/** Activate the next scene. */
-	SCENE_NEXT,
-	/** Activate the first scene. */
-	SCENE_1,
-	/** Activate the second scene. */
-	SCENE_2,
-	/** Activate the third scene. */
-	SCENE_3,
-	/** Move the bottom-most unlocked source in the active scene up. */
-	PAN_UP,
-	/** Move the bottom-most unlocked source in the active scene down. */
-	PAN_DOWN,
-	/** Move the bottom-most unlocked source in the active scene left. */
-	PAN_LEFT,
-	/** Move the bottom-most unlocked source in the active scene right. */
-	PAN_RIGHT,
-	;
-}
\ No newline at end of file
diff --git a/src/main/kotlin/net/eksb/obsdc/OpRunner.kt b/src/main/kotlin/net/eksb/obsdc/OpRunner.kt
index 70ffbb3..c87f6a7 100644
--- a/src/main/kotlin/net/eksb/obsdc/OpRunner.kt
+++ b/src/main/kotlin/net/eksb/obsdc/OpRunner.kt
@@ -13,7 +13,7 @@ import org.slf4j.LoggerFactory
  *
  * Call [run] to run an OBS operation.
  */
-class OpRunner(private val obs:Obs) {
+class OpRunner(private val obs:Obs): (String)->Unit {
 
 	/** How much to pan. */
 	private val panAmount = 50F
@@ -23,10 +23,10 @@ class OpRunner(private val obs:Obs) {
 	/**
 	 * Run the specified [Op].
 	 */
-	fun run(op:Op) {
+	override fun invoke(op:String) {
 		obs.submit { controller ->
-			when(op) {
-				Op.SCENE_NEXT -> scene { scenes, current ->
+			when {
+				op == "SCENE_NEXT" -> scene { scenes, current ->
 					if (current != null) {
 						scenes.asSequence()
 							.dropWhile { scene -> scene != current }
@@ -37,7 +37,7 @@ class OpRunner(private val obs:Obs) {
 						null
 					}
 				}
-				Op.SCENE_PREV -> scene { scenes, current ->
+				op == "SCENE_PREV" -> scene { scenes, current ->
 					if (current != null) {
 						scenes.reversed().asSequence()
 							.dropWhile { scene -> scene != current }
@@ -48,19 +48,21 @@ class OpRunner(private val obs:Obs) {
 						null
 					}
 				}
-				Op.SCENE_1 -> scene { scenes, current -> scenes.firstOrNull() }
-				Op.SCENE_2 -> scene { scenes, current -> scenes.asSequence().drop(1).firstOrNull() }
-				Op.SCENE_3 -> scene { scenes, current -> scenes.asSequence().drop(2).firstOrNull() }
-				Op.STUDIO_TRANSITION -> {
+				op.startsWith("SCENE_") -> scene { scenes, current ->
+					val drop = op.drop("SCENE_".length).toInt() - 1
+					scenes.asSequence().drop(drop).firstOrNull()
+				}
+				op == "STUDIO_TRANSITION" -> {
 					controller.triggerStudioModeTransition { response ->
 						log.debug("studio transitioned: ${response.isSuccessful}")
 					}
 				}
-				Op.STUDIO_MODE_TOGGLE -> studioModeToggle()
-				Op.PAN_UP -> transform { old -> positionY(old.positionY - panAmount ) }
-				Op.PAN_DOWN -> transform { old -> positionY(old.positionY + panAmount ) }
-				Op.PAN_LEFT -> transform { old -> positionX(old.positionX - panAmount ) }
-				Op.PAN_RIGHT -> transform { old -> positionX(old.positionX + panAmount ) }
+				op == "STUDIO_MODE_TOGGLE" -> studioModeToggle()
+				op == "PAN_UP" -> transform { old -> positionY(old.positionY - panAmount ) }
+				op == "PAN_DOWN" -> transform { old -> positionY(old.positionY + panAmount ) }
+				op == "PAN_LEFT" -> transform { old -> positionX(old.positionX - panAmount ) }
+				op == "PAN_RIGHT" -> transform { old -> positionX(old.positionX + panAmount ) }
+				else -> log.error("Unhandled op \"${op}\"")
 			}
 		}
 	}