Introduce multi band amps #228

Job	Run time
Tests on other platforms (windows-2019, 3.10)	3m 32s
Tests on paywalled platforms (macos-13-xlarge, 3.12)	1m 15s
Tests on other platforms (windows-2022, 3.11)	2m 50s
Tox test (py38)	2m 39s
Tests on other platforms (windows-2022, 3.12)	3m 25s
Tox test (py39)	2m 33s
Tests on other platforms (macos-12, 3.11)	2m 37s
Tox test (py310)	2m 44s
Tests on other platforms (macos-13, 3.12)	2m 58s
Tox test (py311)	2m 29s
Tox test (py312-cover)	5m 18s
Tox test (docs, graphviz)	1m 44s
Docker image	52s
PyPI packaging	0s
	34m 56s

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