Hm. There is something wrong.I just tried saving a plain patcher with just a multislider set to 15 sliders. closed it opened it and I don’t have the problem, it came up with the 15 sliders.
Maybe m4l specific?
Workaround suggestion: freeze the attribute?
Loadbang your messagebox?
Behold, I believe I have found the answer! It is indeed the (pattr steps) object causing this problem (this became evident when the prescribed size 16 message box solution did not in fact work). To fix this issue, click on the pattr steps object and open the inspector. Under the Parameter heading, find the Type field, and change from Int (0-255) to Blob, then re-save the patch. The multislider should now stay at 16 bars, and Live will save the sequencer settings when you reload the project.