Gary Thoms, David Adger, Caroline Heycock, E Jamieson, Jennifer Smith We (minimally Gary and Caroline) are hosting our live Q&A on April 14th at 1pm-3pm German time (noon-2pm UK time, 7am-9am EST), and will do so primarily this zoom link: https://nyu.zoom.us/j/97967022273 If this slot doesn't work for you, we would be delighted with your feedback via email! You can email Gary in the first instance - gary dot thoms at gmail dot com - and can copy in as many co-conspirators as you see fit. Abstract Much work in comparative syntax proposes that variation is explained both in terms of variation in syntactic features and variation in spellout (Barbiers 2009). While much work has addressed the theories of features (or 'parameters'), our understanding of “variation in spellout” remains underdeveloped. We contribute to this with a study of the amn’t gap, using data from the Scots Syntax Atlas. Looking at microvariation in acceptance of amn't in certain syntactic contexts, we that it is conditioned by inventories of forms rather than features, and we argue such variation must be understood in terms of spellout. Our account demonstrates the utility of Yang’s (2016) Tolerance Principle in explaining morphosyntactic microvariation.