Christian Salmond, daughter of (possibly) Patrick Salmond in (not of) Balquhatstone, married George Waddell of Balquhatstone in July 1661. They had one son, Patrick, and Christian died in 1663. There is a testament dative to this effect.
The index to the Register of Sasines is not very informative. It mentions Robert S, portioner of Balwhatston and his relict Elizabeth Manuel, who were married on 25 September 1681. (Robert must have died not long afterwards because Elizabeth married Robert Howie, portioner of Easter Glentore, on 16 May 1686 and became my 6th-great-grandmother.) The relevant sasine is (RS42) VIII.86, which is between 1685 and 1688. I probably have a copy of it, filed under 'illegible'.
Peter Salmond of Whitrig, formerly in Balwhatston, is mentioned in (RS42) VIII.106 and 301, which are from the same period.
Peter Salmon of Balquhatstan is mentioned in (RS42) XIII.376 (1721-1729)
Various other Salmon(d)s who may or may not be connected
John S and Patrick S in Whitsyd (RS42) VIII.300 (1685-1866)
John S of Whiteside (Whitsyd), son of Patrick S, portioner of West Craigs, (RS42) XIV.528 (bis); XV.189; XVIII.103; XX.43 and Jean Main his spouse, daughter of William M of Meadowhead (RS42) XIV.528 (bis); XX.43. (1729-1778)
Peter S of Whin and his son, also Peter (RS42) XIII.339 (1721-1729)
Patrick S, portioner of West Craig (in Craigs) (RS42) XIV.528 (bis); XV.189 (1729-1745) features in some of the same sasines as John above.
William S in Auchengria (RS40) IVA.350; (RS42) II.126; XII.90 (1631-1719) looks unlikely in fact to be the same person throughout, but XII.90 and William S in Auchengray (RS42) XIV.518 (1729-1745) may be the same person.
William S in Whyteside (RS42) XIII.619 (1721-1729)
A word of explanation. The Sasines are gathered in volumes, which are numbered in Roman numerals. The Arabic numbers are the page on which the particular sasine starts.The dates I have added in brackets are the year of the start of the first volume and the year of the end of the last volume containing the named person(s). Vol XIV, for instance, runs from 2 July 1729 to 8 Feb 1745. You need to get the original document to get the exact dates.