Tanglewood TW4 Product Overview The TW4 Winterleaf is an electro acoustic guitar from Tanglewood featuring a solid spruce top that provides bright and warm tone. There's also Mahogany back and sides which only helps to enhance the punchy mid range. Onboard you will find a B-Band M-450T preamp which features a 4 band EQ and a built in tuner. The preamp also features an HZZless preamp circuit designed to reduce signal noise. The guitar comes in a striking Whisky Barrel Burst Gloss.