Section 9--624. Waiver.

(a) Waiver of disposition notification. A debtor or secondary obligor
may waive the right to notification of disposition of collateral under
Section 9--611 only by an agreement to that effect entered into and
authenticated after default.

(b) Waiver of mandatory disposition. A debtor may waive the right to
require disposition of collateral under Section 9--620 (e) only by an
agreement to that effect entered into and authenticated after default.

(c) Waiver of redemption right. Except in a consumer-goods
transaction, a debtor or secondary obligor may waive the right to redeem
collateral under Section 9--623 only by an agreement to that effect
entered into and authenticated after default.