Spider-Girl #3 is the first and to date, only appearance of this costumed identity. Yup. Not only do we never see this identity of Phil's again, unless I'm mistaken it's never mentioned again either. Interesting to note that when he lost his Goblin gear, Phil still seemed to have an affinity for the sonic motif. This would help to explain how Phil appeared to have his Lunatic Laugh sonic abilities in Spider-Girl #5 without the use of any equipment. Did Phil gain sonic scream powers in the unseen years between giving up the Green Goblin role and his present day civilian self in the MC2? Or did he always have them?
On a side note, the Blue Wail costume design bares more than a passing resemblance to another MC2 sound-based super: Reverb. Reverb was the name one of the Hobgoblin's henchmen -Rudolph- gave to himself when donning the high-tech sound-based suit (Amazing Spider-Girl #2).
At first I thought the resemblance must be more than mere coincidence. However the origin of the tech appears to be the Brotherhood of Scriers, who gifted a sonic device to the Hobgoblin when he was tasked with killing Spider-Girl. The sonic device would be utilized to fatal effect when Hobgoblin killed the former Venom symbiote when she -the symbiote- defended the recently wounded Mayday in Spider-Girl #100.
Still, it's possible a connection could exist between the Blue Wail suit worn by Phil Urich and the sonic technology the Scrier's possess which the Hobgoblin later repurposes. There's a potential story in there somewhere, I'm sure. The untold story of Phil Urich's failed attempts at playing hero.
Until I figure out where Phil got that scar, I remain
frogoat