<html> Hi Rogerio,                  Quite a common request from top performers. Although I have not heard it called a Debussy pedal. Half pedalling is all but impossible on a pedals , dampers or action frames, that are badly worn. Every mm of movement of the pedal MUST be cleanly transmitted to the action cavity. Half peddling damper.  The pedal is depressed to the point that the strings are just, and no more, starting to cause the strings to bleed. Used to add extra texture to a melodic passage.  Used quite offen on repeat passages. To offer subtle contrast. If you press the pedal, say 1/4" the results must be consistent, hence trap work must be in good condition. It is also critical that the dampers be correctly timed. Half peddling unacorda. Again the shift pedal trap work and check block hardware must be in good condition. The pedal again is just partially depressed, just enough to get out of the grooves.  The softer felt will change the voicing.  If there is new hammers, or they have just been reshaped, there will be little or no contrast.  To voice for good unacorda operation. Block each hammer to the string, make a small pencil mark exactly between the strings, also mark exactly the same distance to the left of the left hand string. Needle about 1mm deep at or close to the strike point. A note on damper half peddling, Sewn flat damper felt, will give the greatest amount of variation.  Firm bichord and unichord will exhibit the smallest amount of contrast. I'm in the midst of writing a 5 chapter series on grand dampers, half peddling is covered in depth, including the use of various felt qualities. Hope this makes sense. Regards Roger At 06:59 PM 04/09/00 -0300, you wrote: <blockquote type=cite cite>To the list Yesterday I went to tune a Yamaha Grand (G5) and the pianist that came from France asked me to regulate the sustain pedal half way. I was surprised because I never heard nothing about and he said to me that in Europe the technicians regulate the sustain pedal in a special way in order of the pianist to play Debussy. I would like to know how to do this. I suppose that this is impossible and that the pianist with rapid movements of the pedal may obtain an special effect. Rogerio Cunha IC Member of the Piano Technicians Guild Rio de Janeiro - Brazil </blockquote> <div>Roger Jolly</div> <div>Saskatoon, Canada.</div> <div>306-665-0213</div> Fax 652-0505 </html>