These rules and any amendment of them shall apply in the form in effect at the time the administrative requirements are met for a demand for arbitration or submission agreement received by the AAA.  The parties, by written agreement, may vary the procedures set forth in these rules.  After appointment of the arbitrator, such modifications may be made only with the consent of the arbitrator.

(b) Unless the parties or the AAA determines otherwise, the Expedited Procedures shall apply in any case in which no disclosed claim or counterclaim exceeds $75,000, exclusive of interest and arbitration fees and costs.  Parties may also agree to use these procedures in larger cases. Unless the parties agree otherwise, these procedures will not apply in cases involving more than two parties.  The Expedited Procedures shall be applied as described in Sections E-1 through E-10 of these rules, in addition to any other portion of these rules that is not in conflict with the Expedited Procedures. 

(c) Unless the parties agree otherwise, the Procedures for Large, Complex Commercial Disputes shall apply to all cases in which the disclosed claim or counterclaim of any party is at least $500,000, exclusive of claimed interest, arbitration fees and costs. Parties may also agree to use the Procedures in cases involving claims or counterclaims under $500,000, or in nonmonetary cases.  The Procedures for Large, Complex Commercial Disputes shall be applied as described in Sections L-1 through L-4 of these rules, in addition to any other portion of these rules that is not in conflict with the Procedures for Large, Complex Commercial Disputes.