Translation to/from the MIDI 1.0 Protocol
JR Clock and JR Timestamps cannot be translated to Non-UMP MIDI 1.0 Systems, but they can be used by a Translator to improve timing. If a Translator understand JR Timestamps and receives messages with JR Timestamps, then when translating from a connection with JR Timestamps to a connection that does not support JR Timestamps, the Translator shall schedule the MIDI 1.0 Protocol messages according to the received JR Timestamps. When translating from a connection that does not support JR Timestamps to a connection with JR Timestamps, the Translator may generate JR Timestamps based on the time of reception.
MIDI 1.0 does not send delta times at all, so you can only adjust the time at which events are sent.