vi inserisco la patch fin dove sono arrivato, che senò mi rendo conto che non è semplice rispondermi.
Ho messo un contorno rosso ai 3 tasti utili, uno per caricare la canzone, uno per avviare la canzone (e stopparla) e l'ultimo per riprodurre lo scratch.
ho anche separato la patch in due blocchi, così da distinguere la patch già fatta per lo scratch, e quella della function che ho costruito io.
per vedere bene l'oggetto che simula il giradischi c'è bisogno del file jsui_SCRATCH.js reperibile qua:
http://tratadodeintegracion.cc/stream/wp-content/uploads/2009/07/pruena2.zipassieme a tutta la patch
<pre><code>
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-----------end_max5_patcher-----------
</code></pre>