here's my setting
guitar -> ibanez weeping demon wah -> amp
boss dd-20 giga delay in effects loop
both pedals are powered with a single boss psa 100p adaptor.

problem is a strong hum with noise and feedback. if i pull the plug from the delay, noise will be reduced slightly. if i further on pull out the 2 cables from the effects send/return jacks, i get a satisfactory very mild hum.

previously i asked if i needed a noise gate, but is it possible that if i use ibanez's adaptor for the wah i shall get no noise?

by the way, the delay gives me no problems when used alone. only the combination of these 2 effects (wah and delay) seems troublesome.

advice please?