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copied!<p>No idea without getting more familiar than I'd prefer with your SoX...</p> <p>However, I'd try this:</p> <p>As a test, use a single .wav file</p> <pre><code>for /r %%n in (justone.wav) do ( START "Left" C:\sox\sox.exe %%n -c 1 %%n.left.flac remix 1 START "Right" C:\sox\sox.exe %%n -c 2 %%n.right.flac remix 2) </code></pre> <p>And perhaps it'll run two instances simultaneously on a multi-processor machine. (Window title is "Left" or "Right")</p> <p>Now - if this works, then try</p> <pre><code>@ECHO OFF SETLOCAL for /r %%n in (*.wav) do CALL :runsox "%%n" GOTO :eof :runsox CALL :wait START "%~1.left" C:\sox\sox.exe %~1 -c 1 %~1.left.flac remix 1 CALL :wait START "%~1.right" C:\sox\sox.exe %~1 -c 2 %~1.right.flac remix 2 GOTO :eof :wait FOR /f %%c IN ('tasklist^|find /i /c "sox.exe"') DO SET running=%%c IF %running% GEQ 6 timeout /t 5 >nul&GOTO wait GOTO :eof </code></pre> <p>What this will do is execute the <code>:runsox</code> procedure for each <code>.wav</code> encountered, passing the .wav` name.</p> <p>The <code>runsox</code> procedure will call the <code>wait</code> procedure - which I'll come to. When the <code>WAIT</code> is finished, it'll put on the left sox, then wait again and put on the right, then return for the next filename until all's done. The <code>%~1</code> in the names means 'the first parameter given to this routine, minus any enclosing quotes` - and that's the filename (%%n) provided by the CALL.</p> <p>the <code>wait</code> procedure finds out how many <code>SOX.EXE</code> instances are running by passing a list of tasks from <code>tasklist</code> through a <code>find</code> filter to find the string <code>sox.exe</code> <code>/i</code> means regardless of case and <code>/c</code> means output a count.</p> <p><code>Running</code> therefore acquires a count of the instances of <code>SOX</code> in progress. If that is greater than or equal to 6 (an arbitrary number - choose it to suit yourself. Best to leave one or two processors for other tasks, so 6 id good for an 8-processor machine) then a timeout of 5 seconds is executed and after 5 seconds the tasklist is examined again. When there are fewer than 6 instances, the <code>wait</code> procedure exits and the next task is started.</p> <p>So - the <code>WAIT</code> procedure waits until there are fewer than 6 SOX instances.</p> <p>Change the 6 to suit your machinery and the 5 your aesthetics.</p> <p>Edit: remove legacy closing-parenthesis</p>

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