What's a good pick up to use to amplify arco on an upright? I have an Azola Lightening Bug upright with the Azola "Tru-Accoustic Piezo" pickup. The music director at church noted that I couldn't keep the notes sustained when I switched notes or bowing moving (in other words, the sound dropped off dramatically when I changed notes or bowing direction). As it is, I need considerable pressure to make the strings speak and for the pickup up to reproduce the note. Are there other pick-ups that I can put on a regular upright that may be more suitable for arco?Thanks, Brian