Soloed mix breaks on import

[kevincennis]

From @ruthmann:

The load of the files breaks if you have a track soloed in the hash.

See: http://kevvv.in/mix/#{"name":"1901","gain":1,"minTime":3,"maxTime":192,"tracks":[{"name":"Kit L","path":"sounds/1901_drumsleft.mp3","gain":0.5175,"pan":-1,"muted":false,"muted":false,"soloed":true,"afl":true,"duration":211.62612915039062},{"name":"Kit R","path":"sounds/1901drumsright.mp3","gain":0.5175,"pan":1,"muted":false,"muted":false,"soloed":true,"afl":true,"duration":211.62612915039062},{"name":"Triggers","path":"sounds/1901triggers.mp3","gain":0.57045454545455,"pan":0,"muted":false,"muted":true,"soloed":false,"afl":true,"duration":211.0693817138672},{"name":"Bass","path":"sounds/1901bass.mp3","gain":0.38159090909091,"pan":0,"muted":false,"muted":true,"soloed":false,"afl":true,"duration":211.0693817138672},{"name":"Keys","path":"sounds/1901keys.mp3","gain":0.76318181818182,"pan":-0.31817540662604,"muted":false,"muted":false,"soloed":true,"afl":true,"duration":211.0693817138672},{"name":"Gtr 1","path":"sounds/1901gtr1.mp3","gain":1.0604318698347108,"pan":-0.16763424252422,"muted":false,"muted":false,"soloed":true,"afl":true,"duration":211.0693817138672},{"name":"Gtr 2","path":"sounds/1901gtr2.mp3","gain":0.805,"pan":0.44667745226923,"muted":false,"muted":true,"soloed":false,"afl":true,"duration":211.0693817138672},{"name":"Synth 1","path":"sounds/1901synth1.mp3","gain":0.41295454545455,"pan":-0.020272528811521,"muted":false,"muted":true,"soloed":false,"afl":true,"duration":211.0693817138672},{"name":"Synth 2","path":"sounds/1901synth2.mp3","gain":0.61159090909091,"pan":0.30769297080169,"muted":false,"muted":true,"soloed":false,"afl":true,"duration":211.0693817138672},{"name":"Siren","path":"sounds/1901siren.mp3","gain":0.54886363636364,"pan":0.086623719781989,"muted":false,"muted":true,"soloed":false,"afl":true,"duration":211.0693817138672},{"name":"Vox FX","path":"sounds/1901voxfx.mp3","gain":0.87295454545455,"pan":0,"muted":false,"muted":true,"soloed":false,"afl":true,"duration":211.62612915039062},{"name":"Ld Vox","path":"sounds/1901leadvox.mp3","gain":1.0088636363636,"pan":0,"muted":false,"_muted":true,"soloed":false,"afl":true,"duration":211.62612915039062}]}

If you set all "soloed" fields to false, all works fine.