[Discuss-gnuradio] Problem with FFT of simple signal

[Emil Molin]

Im learning about gnuradio for my final thesis (quite common i see) and i wanted to show a simple FFT of a simple signal (or noise) but the only thing i get the GUI working for is audio input from the microphone. Running it with a generated signal causes the program to freeze.
Here is my code: (ive commented out the non working parts)

#!/usr/bin/env python

from gnuradio import gr,gru
from gnuradio import audio
from gnuradio.wxgui import stdgui2, fftsink2
import wx
import sys

class app_top_block(stdgui2.std_top_block): 
    def __init__(self,frame,panel,vbox,argv):
        stdgui2.std_top_block.__init__(self, frame, panel, vbox, argv)
        sample_rate=44100
        self.frame = frame
        self.panel = panel
        self.vbox = vbox
                
        #self.soundsrc = gr.sig_source_f(sample_rate,gr.GR_SIN_WAVE,350,0.1) #NOTE:Doesnt Work
        self.soundsrc = audio.source(sample_rate,"")    #Works
        #self.soundsrc = gr.noise_source_f(gr.GR_UNIFORM,0.1)    #Doesnt work
        
        self.scope = fftsink2.fft_sink_f(panel, fft_size=1024, sample_rate=sample_rate, fft_rate=30,ref_scale=1.0, ref_level=0, y_divs=12)
        self.connect(self.soundsrc,self.scope)
        vbox.Add(self.scope.win, 10, wx.EXPAND)
    
if __name__ == "__main__":
    app = stdgui2.stdapp(app_top_block,"Tone FFT",nstatus=1)
    app.MainLoop()