The pump is paced off the clock. XMMT.ocx has a TxBufLen property and answers when it is asked, so the bridge could report what the engine still holds and make the red text exact, but the engine does not start on this machine and the property could not be watched while a message was going out. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RoGtneMQaz4M9w7Kk49AVD