Hi, I'm looking for advice on (new?) strings for my son. He currently plays a 1/4 size bass with 1.5 year old Helicore strings. He plays in an orchestra a few hours per week, and a jazz band once per week - so mostly arco, with some jazz pizzicato. He practices about an hour a day. In a few months he is going to play his first concerto with the youth orchestra, and it necessitates solo tuning. It is not easy to play with those Helicores tuned for solo playing - they are tight! Should he get new strings that would work better for practicing the solo? Does he need special "solo" strings? What do others do? He will need to practice this solo concerto for a bit every day until the concert, in addition to his other stuff. Thanks so much!