Dork-rock perfectionist Tom Scholz, leader and mastermind of Boston, has spent the last seven years trying to figure out how to stretch out one decade's tinker-toy guitar sound and un-campy Queen rip-off (''More Than a Feeling'') into another decade's worth of mortgage payments. And he's succeeded. Walk On is much more than a feeling it's pure product! Three new singers re-create original vocalist Brad Delp's castrati style, and four pages of an accompanying booklet urge fans against domestic violence, buying fur, and hunting but nothing about wasting trees. Brought to you by the conglomerate that successfully regurgitated Meat Loaf, it goes down like Tuna Helper. C+

