Model GB 4-Tandem (2/1-tandem) kutentha kwanyengo - ma drimary otenthetsera anayi, kutentha kumatha kuwongolera nthawi, kutentha kumatha kuwongolera kuti akwaniritse zofunika kuchita. yowongolera nthawi yonse yoyenda, kutsogolo ndi kumbuyo kwakanthawi. kuyerekezeka kwa oatora ambiri m'mabatani ang'onoang'ono ndi mitundu ya zikopa.
Chidutswa chofunikira cha zida zogwiritsidwa ntchito kwambiri m'matumbo, ng'oma zamatabwa wokhala ndi mitengo yokwezedwa kapena matabwa achikopa. Chikopa chimatha kukonzedwa nthawi yomweyo m'matumba mkati mwa Drum. Mukamayendetsedwa ndi zida kuti zizizungulira, chikopa chomwe ng'oma chimayang'aniridwa mosasunthika, kutambasula, kusanthula ndi zochita zina zamakina ndikusintha zinthu zakuthupi. Kugwiritsa ntchito kwa Drum kumakwirira njira zambiri zodzitchinjiriza, komanso zofewa komanso zowuma, etc.
