There is no applicable method for the generic function
  #<STANDARD-GENERIC-FUNCTION CL-MIXED:SIZE (5)>
when called with arguments
  (0.0).
   [Condition of type SIMPLE-ERROR]

Restarts:
 0: [RETRY] Retry calling the generic function.
 1: [CONTINUE] Continue with fingers crossed.
 2: [ABORT] abort thread (#<THREAD "#<DEFAULT-SERVER running> process thread." RUNNING {100565EDD3}>)

Backtrace:
  0: ((:METHOD NO-APPLICABLE-METHOD (T)) #<STANDARD-GENERIC-FUNCTION CL-MIXED:SIZE (5)> 0.0) [fast-method]
  1: (SB-PCL::CALL-NO-APPLICABLE-METHOD #<STANDARD-GENERIC-FUNCTION CL-MIXED:SIZE (5)> (0.0))
  2: ((:METHOD HARMONY:PROCESS (HARMONY:BUFFER-SOURCE T)) #<HARMONY:BUFFER-SOURCE  playing> 441) [fast-method]
      Locals:
        HARMONY:BUFFERS = #(0.0 0.09505605 0.18925126 0.2817326 0.3716625 0.45822653 ...)
        CL-MIXED:OUTPUTS = #(#<CL-MIXED:BUFFER {1002938983}>)
        HARMONY:SAMPLES = 441
        HARMONY:SOURCE = #<HARMONY:BUFFER-SOURCE  playing>
  3: ((LAMBDA (HARMONY:SAMPLES HARMONY:SEGMENT) :IN "/home/janne/apps/portacle/projects/shirakumo/harmony/source.lisp") 441 #.(SB-SYS:INT-SAP #X7FFFE8038260))
  4: ((LAMBDA (SB-ALIEN::ARGS-POINTER SB-ALIEN::RESULT-POINTER FUNCTION) :IN "/home/janne/apps/portacle/lin/asdf/cache/SBCL-1.3.17-Linux-X86-64/home/janne/apps/portacle/projects/shirakumo/cl-mixed/segments..