InstantForum 2017-1 FinalMillisecond Forumshttps://forums.millisecond.com/Millisecond ForumsThu, 30 Apr 2026 08:20:33 GMT20https://forums.millisecond.com/Topic12902.aspxI am trying to give subjects the opportunity to set the volume to a comfortable level at the start of each session.<div>I have set volume as a value as follows:<div><span style="font-size: 10pt;">&lt;values&gt;</span></div><div><div><div>/Vol=-5000</div><div>&lt;/values&gt;</div></div><div><div><span style="font-size: 10pt;">and&nbsp;</span></div><div><div>&lt;sound TestSound&gt;</div><div>/items = ("TestSound.wav")</div><div>/volume = (values.vol)</div><div>&lt;/sound&gt;</div></div></div><div><div><div><br/></div>I have tried a variety of ways of setting the variable using blocks and trials but nothing seems to work.<div>Here is an example:<div><br/></div><div><div><div><span style="font-size: 10pt;">&lt;trial VolChange&gt;</span></div><div>/inputdevice = mouse</div><div>/stimulustimes = [0 = VolumeUp, VolumeDown, Continue; 1000 = TestSound]</div><div>/validresponse = (VolumeUp, VolumeDown, Continue)</div><div>/correctresponse = (Continue)</div><div>&lt;/trial&gt;</div></div><div><br/></div><div>&lt;block AdjustVol&gt;</div><div>/trials = [1-50 = noreplace(VolChange)]</div><div>/branch = [if(trial.volchange.response==VolumeUp) values.vol+= 1000]</div><div>/branch = [if(trial.volchange.response==VolumeDown) values.vol-= 1000]</div><div>/branch = [if(block.adjustvol.correctstreak&gt;0) block.600block]</div><div>&lt;/block&gt;<div><div><br/></div>Even the last branch (correct streak) doesn't work for me.<div><div><br/></div>I would very much appreciate advice.</div></div></div></div></div></div></div></div></div>Sat, 05 Apr 2014 19:13:29 GMTrburtonaushttps://forums.millisecond.com/Topic12921.aspxThank you very much. I posted after a day of struggling. Its a great relief to have something that works.<div><div><br/></div><br/></div>Sat, 05 Apr 2014 19:13:29 GMTrburtonaushttps://forums.millisecond.com/Topic12903.aspxThere are various syntax errors in your code. Particularly missing double-quotes and inappropriate use of /branch (you want /ontrialend, not /branch):<div><br/></div>&lt;values&gt;<br/>/ myvolume = -5000<br/>&lt;/values&gt;<br/><br/>&lt;block myblock&gt;<br/>/ trials = [1=mytrial]<br/>&lt;/block&gt;<br/><br/>&lt;trial mytrial&gt;<br/>/ stimulusframes = [1=mysound, mytext, up, down, stop]<br/>/ inputdevice = mouse<br/>/ validresponse = (up, down, stop)<br/>/ ontrialend = [if (trial.mytrial.response=="down" &amp;&amp; values.myvolume &gt; -10000) values.myvolume -= 500]<br/>/ ontrialend = [if (trial.mytrial.response=="up" &amp;&amp; values.myvolume &lt; 0) values.myvolume += 500]<br/>/ branch = [if (trial.mytrial.response != "stop") trial.mytrial]<br/>&lt;/trial&gt;<br/><br/>&lt;sound mysound&gt;<br/>/ items = ("mywav.wav")<br/>/ volume = values.myvolume<br/>&lt;/sound&gt;<br/><br/>&lt;text mytext&gt;<br/>/ items = ("Volume = &lt;%sound.mysound.volume%&gt;")<br/>&lt;/text&gt;<br/><br/>&lt;text up&gt;<br/>/ items = ("+")<br/>/ position = (50%, 45%)<br/>&lt;/text&gt;<br/><br/>&lt;text down&gt;<br/>/ items = ("-")<br/>/ position = (50%, 55%)<br/>&lt;/text&gt;<br/><br/>&lt;text stop&gt;<br/>/ items = ("stop")<br/>/ position = (50%, 75%)<br/>&lt;/text&gt;<br/><br/>Sat, 05 Apr 2014 02:41:42 GMTDave