asio, recorder.prefix

string pester tests for potato pass

manual test passes
- bus.device.asio

lib/recorder.ps1

@@ -25,6 +25,7 @@ class Recorder : IRemote {
         AddActionMembers -PARAMS @('replay', 'ff', 'rew')
         AddFloatMembers -PARAMS @('gain')
         AddIntMembers -PARAMS @('prerectime')
+        AddStringMembers -PARAMS @('prefix') -WriteOnly
 
         AddChannelMembers
     }
@@ -117,16 +118,6 @@ class Recorder : IRemote {
         }
     )
 
-    hidden $_prefix = $($this | Add-Member ScriptProperty 'prefix' `
-        {
-            return Write-Warning ("ERROR: $($this.identifier()).prefix is write only")
-        } `
-        {
-            param([string]$arg)
-            $this._prefix = $this.Setter('prefix', $arg)
-        }
-    )
-
     hidden $_filetype = $($this | Add-Member ScriptProperty 'filetype' `
         {
             return Write-Warning ("ERROR: $($this.identifier()).filetype is write only")