Clock cd4013,in delay pedals

[POTL]

just wondering. Almost all analog delay circuits use the mn3102/3101 as a clock In memory man we see cd4047. I don't like the way the modulation sounds in pedals with cd4047, Small Clone, Memory Man, Ada flanger, it's deep and uneven, wave-like. 3101/3102 in a delay with modulation is used in the chase bliss delay, the modulation sounds much nicer, but I'm not sure that it's realistic to create it without using optics (I haven't seen any other circuits. The cd4013 is not used in delays, I have only seen this clock in the old MXR analog delay. What's the matter, this clock is not suitable for two mb3005 chips and cannot be used for delay and modulation at the same time. I think that the modulation on the cd4013 is much nicer than on the cd4047 and it is more flexible than with the 3101/3202.