Allow me to comment on the "when-to-install-the-Dampp-Chaser" question. Please do not construe this as an endorsement of Yamaha's policy regarding DC systems! Back when I was an independent tuner, I usually tried to schedule an installation at a time of year when the relative humidity hovered around the target range of 42% for a spell. There was a time when I might install it, and then ask the customer to write a date on their calendar roughly six weeks before I was scheduled to return (and yes,I scheduled appointments in advance), and plug it in. This, predictably, met with limited success. Otherwise, I found the best way, was to have the components in the trunk of my car, and install them as I encountered a piano which was reacting to humidity swings, and schedule an appointment for 6 to 8 weeks hence. I used the extra time to take a leisurely lunch or get a bit ahead on that day's appointments. Or, even get home (gasp) early. I only once tuned a piano at the same time as I installed a DC system...and I regretted it. Tough job to explain why I proceeded to tune it knowing this would happen. Steve
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