Solution of R6G was excited by three pairs of 2nd harmonic of Nd:YAG laser in Shank type geometry to produce multiple dynamic gratings at the same spatial location in dye cell. The result of their concurrent operation are presented in this paper. It will be shown that when the delay between the three sets of excitation beams is varied within coherence length of the pump laser, the number of dynamic volume gratings and hence the colors of multiple oscillating lines become tunable. Five lines were observed for two pairs of excitation beams and maximum nine lines for three pairs of beams. The colors of these 9 spectral lines varied from green to pink and were equally spaced in their spectrum. This experimental study was conducted precisely as a function of optical path differences between three sets of excitation beams varying from 1 to 9 mm among three sets of pump beams. The effect of coherence length and state of polarization of excitation laser on emission of multiple lines were investigated. No external gratings were used to excite the gain medium. The results shown promising applications in photonic switching, optical computing and LANs.