Tissue repair compositions, particularly bone repair compositions, containing demineralized bone fragments and homogenized connective tissues. A master built-in-self-test engine is configured to drive a test word into the write path of at least one master switch box and to control the cross-bar switch so that the driven test word is broadcast to all the buffers for storage. The particles are bonded to each other in a pressing procedure with a bonding agent comprising an adhesive such as a polymerizing monomer. These compression circuits are externally adjustable without tools. The performance of the selective-partial-update PNLMS filter compares favorably to an adaptive filter using standard PNLMS for echo paths specified in ITU-T Recommendation G.