Rule 1.7 - Effective Date and Application(a) These rules shall apply to all criminal proceedings commenced upon or after the effective date hereof, and all appeals and other post-conviction proceedings relating thereto.(b) These rules shall also apply to (i) all criminal proceedings commenced prior to the effective date hereof but still pending on such date, and (ii) all appeals and other post-conviction proceedings commenced upon or after such effective date which relate to criminal actions and proceedings commenced or concluded prior to such effective date; Provided That, if application of these provisions in any particular case would not be feasible or would work injustice, these rules shall not apply.(c) The provisions of this chapter do not impair or render ineffectual any proceedings or procedural matters which occurred prior to the effective date thereof.(d) These rules shall become effective on January 1, 1976.