Sound maps, particularly the web-based examples that have proliferated since the early 2000s, have proven compelling and valuable as means of conveying diverse perspectives of urban, rural and wilderness sound environments, while opening the creative process of mapping through field recording to non-expert user groups. As such, sound maps hold the promise of broad public engagement with everyday sonic experience and spatial typologies. Yet this straightforward participatory aim is prone to complication in terms of participatory frameworks and scale of analysis. Drawing on a catalogue of sound maps by the author, this article problematises the participatory norms of sound mapping and, in tandem, calls for a more nuanced approach to scale than typically seen to date in sound maps based on geospatial mapping APIs. A sound mapping workshop in Lisbon with a multidisciplinary participant group provided the opportunity to ‘re-prototype’ sound maps at the scale of a local neighbourhood using multimodal means of representation; the results highlighted questions of form, scale, representation, authorship and purpose in sound mapping and demonstrated its continuing potential as a participatory practice.