You should never sign anything unless you fully understand what it is and what it means. It would be extremely irresponsible of any attorney here to tell you what to do as none of us have enough knowledge about the situation. Go see an attorney to help you find out the answer to your question.
This is not legal advice nor intended to create an attorney-client relationship. The information provided here is informational in nature only. This attorney may not be licensed in the jurisdiction which you have a question about so the answer could be only general in nature. Visit Steve Zelinger's website: http://www.stevenzelinger.com/
I agree with Attorney Zelinger. This forum is meant for general information and you need specific advice after reviewing all the circumstances. You should take the will copy and the letter to an attorney in your area, or where the deceased resided, if not in your area. Use the Find a Lawyer feature on this site as a place to start, as there are several superb probate attorneys in the Columbus/mid-Ohio area.
If this answer is helpful or you feel it is the best answer, please click that option. This response is for general informational purposes only and not for the purpose of providing legal advice. The writer is only licensed to practice law in TN. You should contact your attorney to obtain advice with respect to any particular issue or problem. Use of and access to this Web site or any of the answers by the named attorney do not create an attorney-client relationship between said attorney and the user or browser.
To give you some information beyond telling you to pay an attorney for a better answer, at the very least I can define what the document is for you: In probating a will, a waiver of notice consents to the appointment of an administrator or executor and waives notice of the hearing on the petition. While a waiver of notice enables the probate case to proceed in a timely and efficient manner, the risk is that by waiving notice, an interested party may fail to be present when required for an important hearing.
Therefore, in seeking advice regarding this issue, one would need to know the specifics of the case to determine whether or not it would be prudent for you to excuse yourself from receiving further communication from the court on these proceedings.